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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Polishing blemishes out of spectacle lenses
The prescription specs which I use for computer-based activities have a
scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? -- Cheers, Roger ____________ Please reply to Newsgroup. Whilst email address is valid, it is seldom checked. |
#2
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Polishing blemishes out of spectacle lenses
"Roger Mills" wrote in message
... The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? Toothpaste? That often contains a very fine abrasive. |
#3
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Polishing blemishes out of spectacle lenses
On Wed, 17 Apr 2019 11:38:32 +0100, NY wrote:
"Roger Mills" wrote in message ... The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? Toothpaste? That often contains a very fine abrasive. And all that work will no doubt have altered the prescription of the lens. -- Ermin |
#4
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Polishing blemishes out of spectacle lenses
"Ermin" wrote in message
... On Wed, 17 Apr 2019 11:38:32 +0100, NY wrote: "Roger Mills" wrote in message ... The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? Toothpaste? That often contains a very fine abrasive. And all that work will no doubt have altered the prescription of the lens. I doubt whether polishing off a few thousandths of an inch from the surface of the lens which is probably a couple of millimetres thick will have altered the focal length by a detectable amount. It may have taken off the anti-glare coating, though... |
#5
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Polishing blemishes out of spectacle lenses
Toothpaste? That often contains a very fine abrasive. And all that work will no doubt have altered the prescription of the lens. You will have already stripped any anti-reflection coating- Throw them away and buy some new ones. |
#6
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Polishing blemishes out of spectacle lenses
On 17/04/2019 12:02, DerbyBorn wrote:
Toothpaste? That often contains a very fine abrasive. And all that work will no doubt have altered the prescription of the lens. You will have already stripped any anti-reflection coating- Throw them away and buy some new ones. They don't have an anti-glare coating! -- Cheers, Roger ____________ Please reply to Newsgroup. Whilst email address is valid, it is seldom checked. |
#7
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Polishing blemishes out of spectacle lenses
On Wed, 17 Apr 2019 12:01:12 +0100, NY wrote:
And all that work will no doubt have altered the prescription of the lens. I doubt whether polishing off a few thousandths of an inch from the surface of the lens which is probably a couple of millimetres thick will have altered the focal length by a detectable amount. As they have been attacked witha bit of wet 'n dry and the scratches from that polished out the amount removed may well be more than a few thou. It's the refractive index of the material and shape of the front and back surfaces along with the thickness that give a lens it properties. OP doesn't say if these are basic single vision with no other corrections applied and both eyes more or less the same, made with "normal" refractive index plastic or something more complicated. I wouldn't like to say that few thou wouldn't make a difference with high refractive index lens, it makes a heck of difference to the required thickness of the lens for the same correction. It may have taken off the anti-glare coating, though... No may about it, assuming they had a coating in the first place, most do these days though. -- Cheers Dave. |
#8
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Polishing blemishes out of spectacle lenses
On 17/04/2019 11:20, Roger Mills wrote:
The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? One thing to watch, assuming it is a plastic lens, is if you use a Dremel at too high speed or load the temperature rise can distort the lens. You will only be able to tell when you try looking through it. DAMHIK. |
#9
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Polishing blemishes out of spectacle lenses
On 17/04/2019 11:20, Roger Mills wrote:
The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? I've had good results with Polywatch https://www.amazon.co.uk/polyWatch-Scratch-Remover-Repair-Polish/dp/B00E3T237C Works well on watch "glass" which I'd guess is similar to plastic specacle lenses. -- Reentrant |
#10
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Polishing blemishes out of spectacle lenses
On Wednesday, 17 April 2019 12:01:39 UTC+1, NY wrote:
I doubt whether polishing off a few thousandths of an inch from the surface of the lens which is probably a couple of millimetres thick will have altered the focal length by a detectable amount. You've (rather admirably) used inconsistent units of measure - could we have this expressed in linguini instead? https://www.theregister.co.uk/Design/page/reg-standards-converter.html |
#11
Posted to uk.d-i-y
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Polishing blemishes out of spectacle lenses
On Wednesday, April 17, 2019 at 11:19:28 AM UTC+1, Roger Mills wrote:
The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? -- Cheers, Roger ____________ Please reply to Newsgroup. Whilst email address is valid, it is seldom checked. Bin them. Optically you've probably ruined them already even if you polish the scratches out. Tim |
#12
Posted to uk.d-i-y
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Polishing blemishes out of spectacle lenses
Roger Mills wrote:
The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? I always found that T-Cut (or some similar auto paint polisher) worked well on scratched DVDs borrowed from a library. |
#13
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Polishing blemishes out of spectacle lenses
On 17/04/2019 11:20, Roger Mills wrote:
Whilst I could buy a new lens for £30 or so, Single vision, or....? I've been trying to polish it out on a DIY basis. The affected area is still a bit blurry. I doubt you'll get satisfactory results, but fair play if you do! |
#14
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Polishing blemishes out of spectacle lenses
NY wrote:
"Roger Mills" wrote in message ... The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? Toothpaste? That often contains a very fine abrasive. Rouge is the classical stuff for mirrors. Not that I've ever polished one. -- Roger Hayter |
#15
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Polishing blemishes out of spectacle lenses
On Wed, 17 Apr 2019 11:20:32 +0100, Roger Mills
wrote: The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? I have polished plastics using your methods, also rouge is better than Brasso or T-cut, but the surface ends up at a different curvature. This will cause anything you see through that bit of the lens as distorted instead of just obscured by the scratches. -- Dave W |
#16
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Polishing blemishes out of spectacle lenses
On 17/04/2019 13:10, Reentrant wrote:
On 17/04/2019 11:20, Roger Mills wrote: The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? I've had good results with Polywatch https://www.amazon.co.uk/polyWatch-Scratch-Remover-Repair-Polish/dp/B00E3T237C Works well on watch "glass" which I'd guess is similar to plastic specacle lenses. Thanks. That looks worth a try. Meanwhile, I followed a suggestion here to use toothpaste. That got me back to the frosted glass effect, but smoother than before. Further applications of Brasso has now more or less restored the shine, and it's very difficult to see the blemish - it certainly doesn't jump out at me like it did before. When I look at my computer screen through the blemished bit of the lens, text is not quite so sharp as when looking through other parts of the lens - but it's still readable. To answer a few other questions . . . It's a single vision lens - more or less spherical, about 3.5 diopters with a tiny bit of astigmatism correction. The lenses are NOT coated - Specsavers wanted a lot extra for an anti-glare coating, and I didn't see the point. -- Cheers, Roger ____________ Please reply to Newsgroup. Whilst email address is valid, it is seldom checked. |
#17
Posted to uk.d-i-y
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Polishing blemishes out of spectacle lenses
Poundland or Aldi for some new ones! |
#19
Posted to uk.d-i-y
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Polishing blemishes out of spectacle lenses
On Wednesday, 17 April 2019 11:19:28 UTC+1, Roger Mills wrote:
The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? The"proper"stuff to use is"jeweller's rouge. https://www.ebay.co.uk/i/132360934221?chn=ps Ultra fine abrasive. Used on watch glasses. |
#20
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Polishing blemishes out of spectacle lenses
Given they are mostly plastic, then perspex polish is an idea. you used to
be able to get it in tubes. Brian -- ----- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! "NY" wrote in message o.uk... "Roger Mills" wrote in message ... The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? Toothpaste? That often contains a very fine abrasive. |
#21
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Polishing blemishes out of spectacle lenses
Brian Gaff wrote
Plastic or glass? Very unlikely to be glass anymore. "Roger Mills" wrote in message ... The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? -- Cheers, Roger ____________ Please reply to Newsgroup. Whilst email address is valid, it is seldom checked. |
#22
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Lonely Psychopathic Senile Ozzie Troll Alert!
On Thu, 18 Apr 2019 19:19:31 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: Plastic or glass? Very unlikely to be glass anymore. You LOVE auto-contradicting, eh, senile Rodent? No wonder you got nobody in real life to talk to! BG -- Kerr-Mudd,John addressing senile Rot: "Auto-contradictor Rod is back! (in the KF)" MID: |
#23
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Lonely Psychopathic Senile Ozzie Troll Alert!
On 18/04/2019 10:28, Peeler wrote:
On Thu, 18 Apr 2019 19:19:31 +1000, cantankerous trolling geezer Rodent Speed, the auto-contradicting senile sociopath, blabbered, again: Plastic or glass? Very unlikely to be glass anymore. You LOVE auto-contradicting, eh, senile Rodent? No wonder you got nobody in real life to talk to! BG To be fair he is correct. |
#24
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Polishing blemishes out of spectacle lenses
On 18/04/2019 08:10, Brian Gaff wrote:
Plastic or glass? Brian Plastic, as per my OP. -- Cheers, Roger ____________ Please reply to Newsgroup. Whilst email address is valid, it is seldom checked. |
#25
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Polishing blemishes out of spectacle lenses
On 17/04/2019 23:26, DerbyBorn wrote:
Poundland or Aldi for some new ones! Sadly no. The prescription is different for my two eyes, and the other eye needs much more astigmatism correction which you won't find in off-the-shelf glasses. -- Cheers, Roger ____________ Please reply to Newsgroup. Whilst email address is valid, it is seldom checked. |
#26
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Lonely Psychopathic Senile Ozzie Troll Alert!
On Thu, 18 Apr 2019 11:14:11 +0100, R D S wrote:
Plastic or glass? Very unlikely to be glass anymore. You LOVE auto-contradicting, eh, senile Rodent? No wonder you got nobody in real life to talk to! BG To be fair he is correct. That was only an irrelevant "by-product". He simply wanted to auto-contradict again. ;-) |
#27
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Polishing blemishes out of spectacle lenses
On Wed, 17 Apr 2019 13:09:47 +0100, newshound wrote:
On 17/04/2019 11:20, Roger Mills wrote: The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I tried Brasso but didn't do a lot because the blemish was a bit too deep. I then rubbed the area very gently with very fine wet & dry, used wet. This got rid of the scratches, but left the area looking like frosted glass. I've improved it quite a lot by buffing it with a dremel-like tool, using a buffing paste made from olive oil and talcum powder (how DIY can you get!) followed by a further application of Brasso. The affected area is still a bit blurry. Any ideas of what else to try? One thing to watch, assuming it is a plastic lens, is if you use a Dremel at too high speed or load the temperature rise can distort the lens. You will only be able to tell when you try looking through it. DAMHIK. Yeah, YJD... :-) That's *not* the bad news when using a high speed polisher on *plastic* lenses. The bad news is the localised surface melting from the use of such high speed polishing efforts. Even over-vigorous manual application of a polishing rag can melt the surface, completely defeating the whole polishing enterprise (i.e. damaging the surface beyond any such redemption). Plastic surfaces can be polished successfully but it is fraught with this low temperature melting issue that simply doesn't exist with traditional materials such as glass and most metals in common use. Whilst the polishing technique is basically the same for plastics and traditional materials, you have to keep the very low melting points of most plastics in mind and dial back the polishing effort somewhat compared to what you may be used to using with glass and metals. -- Johnny B Good |
#28
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Lonely Psychopathic Senile Ozzie Troll Alert!
On 18/04/2019 15:48, Peeler wrote:
On Thu, 18 Apr 2019 11:14:11 +0100, R D S wrote: Plastic or glass? Very unlikely to be glass anymore. You LOVE auto-contradicting, eh, senile Rodent? No wonder you got nobody in real life to talk to! BG To be fair he is correct. That was only an irrelevant "by-product". He simply wanted to auto-contradict again. ;-) Let him have his moment though! Like a stopped clock, twice per day..... |
#29
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Polishing blemishes out of spectacle lenses
On Wed, 17 Apr 2019 22:26:48 +0000, DerbyBorn wrote:
Poundland or Aldi for some new ones! They go as high as +3.5 dioptres which should suit the OP although the quality can leave a little to be desired. I know because I was trying to find a cheap pair with a dioptre strength beyond this limit to let me get a real close up view of microscopic SMD components. Strangely, none of the usual places selling 'cheap reading glasses' had anything stronger. :- ( I also have a problem trying to find anything weaker than 'strength +1.0' to give me something better optimised for use with my desktop computer monitor. I reckon, mild astigmatism allowing, that a dioptre strength of +0.5 to +0.75 would be about as good as it gets for me. I'm mildly short sighted so have been taking advantage of this for close viewing simply by removing my distance vision spectacles but, at 69 yo, my residual power of accommodation no longer has enough reserve to both accommodate shorter viewing distances *and* apply a modicum of astigmatic correction. The effort to focus on the screen varies throughout the day and, as it happens (mid afternoon), I'm having little difficulty right now in seeing my computer screen sufficiently well enough to distinguish between a colon and a semi-colon (viewing distance of 60 to 70 cms from a 23 inch 1920 by 1080 pixel monitor). A suitable pair of cheap reading glasses would be very useful at times when my visual cortex (perhaps more accurately described as a virtual reality suite) is not at its peak performance during late evening and early morning times. A cheap pair of basic reading glasses of suitable power would off-load the focussing task to free up my accommodating power to concentrate on the task of astigmatic correction during such periods. These days, the trick of removing my distance vision glasses to read the fine print that negates what the large print promises on the packaging of any merchandise I'm checking out when shopping, doesn't work quite as well as it used to do just a seemingly very few years ago. :-( -- Johnny B Good |
#30
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Lonely Psychopathic Senile Ozzie Troll Alert!
On Thu, 18 Apr 2019 11:14:11 +0100, R D S wrote:
On 18/04/2019 10:28, Peeler wrote: On Thu, 18 Apr 2019 19:19:31 +1000, cantankerous trolling geezer Rodent Speed, the auto-contradicting senile sociopath, blabbered, again: Plastic or glass? Very unlikely to be glass anymore. You LOVE auto-contradicting, eh, senile Rodent? No wonder you got nobody in real life to talk to! BG To be fair he is correct. True enough and even if it's actual glass, there'll most likely be the issue of an anti-reflective coating to contend with. If such a coating exists, this too will also have to be polished away from most of the whole lens surface as well to produce an acceptable result. The thirty quid for a prescription set of reading glasses seems cheap considering the effort required to get what might be, at best, a rather poor result. If the Poundland or Home & Bargain offerings don't appeal, there are better quality "Reading Glasses" available at ten times the price by way of a compromise in cost. I can't recall the brand but they were on sale in the post office section of our local WH Smith and seemed better quality (if a little overpriced IMHO - they still didn't offer weaker than +1.25 or stronger than +3.5 dioptre strengths though - probably why I thought them overpriced). -- Johnny B Good |
#31
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Polishing blemishes out of spectacle lenses
On Wed, 17 Apr 2019 11:20:32 +0100
Roger Mills wrote: The prescription specs which I use for computer-based activities have a scuff mark about the size a finger-print from a little finger on one of the (plastic) lenses. Whilst I could buy a new lens for £30 or so, I've been trying to polish it out on a DIY basis. I found jeweller's rouge very effective at taking the scuffs out of my favourite sunglasses where they had fallen out of their case and slid around in the glove-box. |
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