Downey William A DR Optmtrst (South Lake Tahoe,CA 96150)

• Where to buy bifocal sunglasses?

  You can search online, buy them at Walmart or go to the brick and mortar store.

• How can I know my contact lens is inside out?

  If your contact lenses are turned inside out, this will cause some discomfort when blinking your eyes and won't fit close to your eye, as well as cause some slight vision problems. While it's on your finger, an inside-out lens will look like a U with flared edges. A lens in the proper bowl shape, with smooth edges, is in the correct position.

• What does BC stand for on contact lenses prescription?

  BC on contact lenses stands for ""base curve."" The base curve of a contact lens is related to the shape of the patient's eye. It is one of the items in your eyes examination. In most cases, the base curve is the same for both eyes.

• What is the difference between a contact lens prescription and glasses prescription?

  This depends on how strong your power is. A contact lens prescription can be the same as a prescription for glasses when: - the prescription is a lower power, ie: -4.00 to +4.00 and - there is absolutely no astigmatism present. If you have any astigmatism or require a lens power greater than +/-4.00, the parameters of the contact lens can change. - if you have astigmatism under 0.50, a spherical lens should be prescribed. - astigmatism of 0.50 to 0.75 can be effectively corrected with an aspheric lens. - astigmatism greater than 1.00 should be managed with a toric lens. If your prescription power for glasses is greater than +/-4.00, you should see a difference in the power of your contact lens prescription. Generally, every time your glasses prescription increases or decreases by a power of 2, your contact lens prescription will increase by an additional power of +0.25. For every power change of 2 in a glasses prescription, the difference of +0.25 power is needed to compensate for the location of the contact lens. Your glasses are much further from the front surface of the cornea than contact lenses. Sources: http://www.contactlenses.co.uk/education/public/spectacle_vs_contact_lens_rx.htm

• How to prevent my contact lens from wind?

  Sunglasses/goggles may work. If you want to proect your eyes better, the oversized sunglasses may be your first choice cause they can wrap your eyes around.

• Can I use annual contact Lens more than one year?

  It is not recommended to use contact lenses that are out of date. Because the cotact lenses are much easier to be infected during long time of use and there is possiblity that the bacterial stay on the surface of the lenses so as to cause eye diseases.

• Is it necessary to wear sunglasses over the contact lenses?

  It is OK to do so. Wearing sunglasses over the contact lenses add double protection to your eyes, they are much safer from the UV rays, and less likely to be injured.

• Will the contact lens be very thick if I have strong prescription?

  No. contact lenses would not be thicker if you have stronger prescription, instead Focal length of contact lenses decreases.

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