Refractive Eye Testing
Refraction is the process of determining a person’s need for eyeglasses, contact lenses or surgical procedures such as LASIK or PRK.
We have all heard people say “I have 20/20” vision, when they refer to having perfect vision. 20/20 vision is the baseline measurement for optimum eye sight or perfect vision. People who have 20/20 vision are able to read font that is 3/8 of an inch tall from 20 feet away. Often people without 20/20 vision, have a refractive error in their eye. A refractive error means that the light is not bending and reflecting properly in the eye. When this occurs, corrective lenses may be placed in front of the eye (eyeglasses) or on the eye’s surface (contact lenses) to bend the light properly into your eye.
Refractive eye examinations often involve objective and subjective measures of what prescription lenses are required to provide the best vision for a person. Autorefractors are complex optical devices which we use as an objective measure of the refractive errors. Keratometry is a measure of the curvature of the cornea, the clear dome at the front of a person’s eye. Corneal topography can be used to map the cornea showing steeper and flatter portions in greater detail. Together, autorefraction, keratometry, and corneal topography are used to determine the best optical prescription to correct refractive errors. We do this testing to tell if prescription is needed to help correct conditions such as: myopia, hyperopia, astigmatism, and presbyopia. Correction of these refractive errors is often achieved with prescription eyeglasses.
Eyeglasses, Lenses and Lens Treatments
We have a full optical dispensary with prescription eyeglasses for every day wear for all ages including:
- computer eyeglasses
- occupational eyeglasses
- hobby eyeglasses
- safety eyeglasses
- pediatric eyeglasses
- infant eyeglasses
- sports eyeglasses
Contact us today to find out if a refractive error is what is causing your vision problems. We proudly serve patients in the Twin Cities of Minneapolis and St. Paul, Minnesota, and the surrounding communities.