Optometry is a career field that deals with eyes and vision.
- How the eye works: The eye has been said to work in the same way as a camera. The functions are slightly different, but the basics are pretty much the same. Each section of the eye has a different job, working together to have vivid vision. However, the cornea may be compared to a camera lens because it is used as a protective cover. The cornea is one of the most important parts of the eye because it is used to diverge light and move around the pupil to the colored part of the eye known as the iris. The eye sees by focusing light rays from an object onto the retina. The retina is a thin layer in the back of the eye that transmits visual signals to the brain. When the light is not properly focused on the retina, refractive errors occur and require glasses, contact lenses, or refractive surgery to make vision clearer.
- What is a diopter?: A diopter is a unit used for measuring how strong or weak the lens of your eyes are. The diopter is found by reciprocating the focal length in meters. This equation was first used by a French ophthalmologist named Ferdinand Monoyer. For humans, the whole optical power of the eye when relaxed is about sixty diopters. As humans get older, the range of adjustment decreases from about fifteen to twenty diopters in young people such as teenagers to approximately ten diopters at twenty five years old, and about one diopter at the age of fifty and so forth. Positive dioptrics are caused by convex lens and are used mostly for hyperopia which is farsightedness. However, negative dioptrics are caused by concave lens and are used for people who have presbyopia which is nearsightedness.
- How do you correct near sighted or far sighted vision?: You can correct nearsighted vision by wearing contacts, glasses, and laser surgery. These help move pictures from in front of the retina to be on the retina itself. Most of the time, minor hyperopia is left alone, uncorrected. To correct far sighted vision, the optician will most likely prescribe convex lenses because they have a positive dioptric value.
- How does your optometrist determine your contact prescription?:
... you call your optometrist.leesonma 04:28, February 17, 2012 (UTC)