Please share your prescription with us.

R -2.50 -0.50x174
L -3.00 -1.25x175

http://en.wikipedia.org/wiki/Eyeglass_prescription

Both eyes are nearsighted. The first requires a cylindrical (astigmatic)
correction of -0.5 diopters at an angle of 174 degrees.

Note that the angles are in one-degree increments. Is the store supposed to
stock 180 different versions of a lens with -2.5 diopters refraction and -.5
diopters cylindrical? You'd need at least 10,000 different lenses to cover
the common combinations. Even if the cylindrical were limited to 5-degree
increments, you'd still need a huge number of lenses.

No, no, no, no, no. I don't believe it.