University Of Houston (Austin, TX 78717-3005)

• Are there extended wear contacts for astigmatism?

  Yes. There are a wide variety of contact lenses available for astigmatism, including hard, soft and extended wear. You can go to your nearby optical store to ask. But extended contacts are not always safe to wear although they are designed for long time wearing.

• Do contact lenses only come in one size?

  NO, contact lenses can come in different size. Usually contacts for astigmatism are larger than normal contacts. Also the thickness can be different to fit your eyes because people have different base curves.

• Can I buy contact lenses for an astigmatism over the counter?

  It is against the law to sell you contacts without doctor's prescription and also there is no over the counter contact lenses. All prescription contact lenses are made based on your prescription.

• What is the treatment for Night blindness?

  If the night blindness is genetic, there is little chance that it can be cured. But if it is temporary and caused by deficiency of Vitamin A, you can take more food high in Vitamin A such as carrots to cure it.

• Why does eating carrots improve night vision?

  Rhodopsin is important in color detection. Light-sensitive, purple-red organic pigment contained in the rod cells of the retina that allows the eye to see in black and white in dim light. It is composed of opsin, a protein, linked to retinal, a conjugated molecule (see conjugation) formed from vitamin A. So eating carrots which are high in vitamin A can help improve night vision. source? http://wiki.answers.com/Q/How_do_our_eyes_see_color#ixzz1vUUWr0S5

• Are color blind people able to see at night?

  Yes, color blind people can still see things at night. the lack of color vision should not effect the ability to see in the dark. But the world in their eyes is gray.

• Is it normal for astigmatism contact lenses harder in the middle than the outsides?

  YES, it is just that type. Lenses for astigmatism ( toric lenses) are all like that. I think they are more easy to wear than regular soft contacts as they are harder in the middle part.

• How long does it take to get used to hard lens?

  It does feel uncomfortable when you first wear hard contacts. You can try to increase the wearing time like 15 or 30 mimutes or day by day, but don't make big jumps, then you should wear them longer.

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