Portable Auto Refractometer

AUTO REFRACTOMETER MAKE JAPAN AND KOREA USED IN OPHTHALMOLOGY.Autorefractor Keratometer (Auto Ref Keratometer) Autorefractors are used to measure the degree of refractive error in the eye, and are suited well toward applications such as differentiating corneal from lenticular aberrations, and assessing pre-and-post refractive surgery patients.
An autorefractor or automated refractor is a computer-controlled machine used during an eye examination to provide an objective measurement of a person’s refractive error and prescription for glasses or contact lenses. This is achieved by measuring how light is changed as it enters a person’s eye.
An auto-refractor or optometer is an instrument that helps in the automated assessment of refraction. This is an alternative method of finding out the refraction error in contrast to the conventional refractive technique. The procedure is called refractometry or optometry.
Automatic refractometers completely eliminate differences in measured results between operators, and provide the highest level of accuracy.
The principle is known as the optometer principle. This instrument gives the leverage of power variation in the refracting apparatus. The autorefractors using this principle have a single converging lens placed at the focal length distance from the eye instead of interchangeable trail lenses.