Envision Optometry (San Jose,CA 95121)

• Can eye doctor convert eyeglasses RX into Contacts RX?

  The power of contacts can be calculated from that of glasses.Here is a formula :Fo=Fs/(1-dFs).The Fo means your power of your contacts and Fs means the power of glasses.dFs means the distance between rear vertex of glasses and your cornea.Usually the dFs should be measured by meter and it is 0.012m for easterners.For example,the RX of glasses is -4.00,the dFs is 0.012m,we can know that your RX for contacts should be -3.82,but this result is not a regular RX,so we choose the proximal and a lower number , it should be -3.75 . Hope these can help. But even if you can make out the RX,you still need an eye exam for contacts.

• What's the difference between sport sunglasses and regular sunglasses?

  I think the most important difference is sport sunglasses can stay on your head firmly when you are doing physical activity such as running,playing basketball etc while regular sunglasses may fall off. Also the sports sunglasses have a better resistance to external hit to protect your eyes.

• Are there any lenses less thick and don't make my eyes look small?

  There are a several grades of "thin" lens that look like normal lenses. You can choose the high index lenses that can make your lens much thinner ,but usually they are more expensive, but worth it. Any optical shop will have them. Just ask!

• Contacts can see better than glasses that are the same prescription?

  Yes,it is normal.Because the strength you need is usually weaker than the glasses.If they are the same prescription,contacts give you higher prescription to see.So you can see better.

• How to remove scratches from rx eyeglasses?

  Scratches on the plastic eyeglasses are easily removed than other material. You can use Pledge furniture polish cleaner or DVD/CD cleaner and spray the solution in the scratches caused by wear and tear and clean it with a soft cloth.

• What's the highest RX for nearsighted people?

  This varies from different places. The highest rx I've seen was about -15, but I'm sure there are higher numbers out there.You can go to your eye doctor to have your exact prescription and ask them if they offer glasses special for your prescription.

• Will wearing eyeglasses all day long increase your RX over the years?

  Generally speaking, long-term wearing glasses will not increase your prescription. If your power is below +/-2.00, it is not necessary to wear eyeglasses for long hours, but if your power is beyond that, you are suggested to wear it always. If you protect your eyes carefully and pay much attention to eye health, take your glasses off to have rest after several hours weaing and massage the eye strain places, blink you eyes frequently..., The RX power should be kept to a balanced value.

• can sunglasses be semi-rimless?

  Of course they can . It is not hard to find that the majority of sunglass models are full frame ones, because sun glasses are basically expected to cover the whole part of the eyes.But semi rimless sunglasses make it a reality to show more facial natural beauty while ensuring enough UV protection.

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