6 votes

What causes the cornea to change shape in astigmatism?

The specific cause of astigmatism is unknown. It can be hereditary and is usually present from birth. It can decrease or increase over time. - American Optometric Association You might've had it ...
kit's user avatar
  • 828
3 votes

What effects would aspheric contact lenses have on eyes without astigmatism?

A toric lens is the type that is used to treat astigmatism, not an aspheric lens. An aspheric lens is primarily designed to correct for the spherical aberration of the contact lens itself, the ...
Fonebone's user avatar
  • 237
2 votes

Help reading an eyeglass prescription: What does "PL" or "PC" mean?

I finally found this: Plano - PL - This indicates there is no spherical correction in this eye. A plano lens would have no focusing power or correction to it. So it's 0. Source: How to Read and ...
THE JOATMON's user avatar

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