FAQs About Contact Lenses

What is astigmatism?
Astigmatism is usually a natural distortion of the cornea which causes it to be more curved in one direction than the other. You can get it with long or short sight and most people have it to some extent. Occasionally it can be caused by a distortion of the lens inside the eye instead of the cornea, but the effect on focusing is the same. Because the cornea (or lens) is more curved along one direction than the other, it acts as a more powerful lens along that direction causing the image at the back of the eye to be slightly out of focus.

What are contact lenses?
What are "Hard" and "Soft" lenses?
Why does the cornea need Oxygen?
What are high water content lenses?
Why aren't all soft lenses high water content?
Do gas permeable contact lenses absorb water?
Which lenses are best?
What is astigmatism?
I have astigmatism - can I wear soft lenses?
What is presbyopia?
I have presbyopia - can I wear contact lenses?
What are disposable lenses?
Why are contact lens solutions needed?
Do I need to use protein-removing tablets?
Which solution is best for my lenses?
I've been told not to wear my lenses when in an aeroplane - why?
Can I swim in my contact lenses?
Do I still need spectacles if I wear contact lenses?
What is the difference between tinted and coloured lenses?

See also:
All About Contact Lenses
All About Vision
How to make a complaint