Vuong Anh Nguyen, OD

• What are the advantages and disadvantages for transition lens?

  The advantage of transition lens is that you don't have to change your glasses for sunglasses frequently when you go inside and outside frequently. You can wear the same glasses all the time and you don't have to spend extra money to buy prescription sunglasses. However, they have disadvantages, too. Transition glasses are more expensive than regular glasses. With prolonged use, the transition lens cannot change the color as dark as it does in the first few years.

• Why does my eyes keep tearing?

  It can be Herpes simplex keratitis (HSK) and often happens when your body resistance is down.You need to see the doctor immediately otherwise you may get blind.

• Is it common for transition lens tint to start peeling off from inside your glasses?

  That would be some coatings on the lens starting to peel off. Transition lens, unlike other tints, won't peel off. Because there is a kind of substance in the lens that change the color.

• Is the UV protection in a prescription lens enough to protect our eyes?

  That will depend on whether they have full UV protection. A prescription glasses lens can be made with UV protection, in which the special materials are used to protect UV rays. Whether the prescription glasses with UV protection can fully protect your eyes depends on the index of UV protection of the lens. If the lens is made of UV400, then it will block all the UV rays and protect your eyes completely.

• Can children younger than 6 wear sunglasses?

  Children younger than 6 don't actually need sunglasses. But if the lights are too strong,they can wear them for one or two hours and take them off once they get to indoors.

• Are sunglasses the bigger the better?

  No,the sunglasses are not always the bigger,the better. If the size of sunglasses is too big, the curve of the lenses has also to be big. Once the curve is more than 15°,your vision will be uneven when looking through it and can cause eyes tired easily. You can also have dizziness.

• Will the sunglasses lose UV protection when they get wet with water?

  As sunglasses can be cleaned with water,it can't lose UV protection when getting wet with water.But if it is chlorine water,it may lose the UV protection cuz there may be chemical reaction between them.

• What food is good for computer user?

  Carrots, dark leafy vegetables, red dates, sesame, soybean are all good food for computer users.

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