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Can I use sunglasses for computer use?

You'd better use your computer under light but not in the dim light, this will make the screen of your computer weak. Sunglasses can prevent you from some glare and radiation, but they cann't prevent you from computer vision syndrome, such as dry eyes, headaches, eye strains, etc. You should do to your eye doctor for a prescribed computer glasses.

Can the dim light cause pupil to constrict?

No, the dim light and long time using computer can make your eyes strain or fatigue, but is irrelevant to pupil constrict. Work under light and decrease the time of using computer would be good for your vision.

Is there a place I can buy new eyeglasses without a prescription?

If you are looking for a non-prescription eyeglasses, so there is no need to copy the prescription of your current lenses but they need to find the lenses with the same size of your old lenses so as to be fittable for your old frame. But it is hard to find the same size lenses and worker in optical stores will take the risk of breaking the lenses when taking out and putting in. The easist way for you is to find another non prescription pair with the frame you like and the new non-prescription lenses.

How does eyeglasses correct vision problem?

Eye glasses work in the same manner whether they are for nearsightedness or farsightedness. The eye glass lens is curved so that it bends the light rays that hit your eyes so you can see images clearly. Nearsighted individuals cannot clearly see things that are distant. This happens because the light rays come into focus in front of the retina. Farsighted individuals have the opposite problem. The shape of their eyes causes the light rays to come into focus behind the retina, causing things that are near to them to be out of focus. Some people have blurry vision due to an astigmatism, or a condition where the curvature of the eye is irregular, creating a second focal point within the eye. All three of these common problems can be corrected with glasses. Source:http://www.glassescrafter.com/information/how-glasses-correct-vision.html

Is there an eyewear to help relieve computer vision syndrome?

Computer glasses are special glasses prescribed to lessen the symptoms associated with computer vision syndrome (CVS). CVS describes a group of symptoms caused by prolonged computer use. Symptoms appear because the eyes and brain react differently to words on a computer screen than they do to printed text. Symptoms often include eyestrain, dry eyes, headaches and blurred vision. Many people try to compensate for these vision problems by leaning forward or by looking down to see through the bottom portion of their glasses, often resulting in back and shoulder pain. Source:http://vision.about.com/od/eyeglasses/f/Computer_Glasses.htm

Can I make the sunglass lenses to prescripted ones?

Yes, you can. You can take them to any local optical stores and ask the workers to change the non-prescription lenses into the prescription lenses prescribed according to your power.

Does staying in a dark room too long be bad for my eyes?

It will make your eyes feel fatigue and strain. But long time staying in such circumstance can be harmful to your vision. Why not light up your lamp while watch TV? I think it will help.

Can I return the prescription eyeglasses I purchased online?

That will depend on the condition why you want to return your prescription eyeglasses. What's more, different stores have different rules on return and refund. I am sure most stores will ask you to pay for the shipping cost if you return your glasses that you buy online.