Daniel Bitner, MD

• 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.

• 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

• What can I do to keep my eyesight from getting worse?

  The most important thing you should do is to avoid too much close work such as playing computer or reading. Don't always stay up late and do exercise regularly to keep a healthy body. Your overall health is also important to maintain your vision.

• 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.

• 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.

• 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.

• 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.

• How to prevent marks on your nose from sun glasses?

  You can take your sunglasses to your optometrist. He will affix cushioned nose pads to your sunglasses so that your nose does not directly contact with the nose pad of your sunglasses. Then it can prevent marks on your nose.

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