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Clinical Refraction
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Measurement of the refractive error of the eye for the purpose of
eyeglass or contact lens prescription, or for the planning of corneal or
cataract refractive surgery is called clinical refraction.
There are
two primary ways of conducting an assessment of the refractive error of
the human eye.
1. Objective methods.
These involve the projection of
infrared radiation into the eye with subsequent analysis of the
reflected IR by photosensitive electronics. The primary devices for this
test are hand-held skaiscopy (popularly mis-named retinoscopy), and
infrared autorefraction.
2. Subjective methods.
These involve visual
perceptual decisions made by the patient or research subject. Often the
decisions include a subjective judgement of the perceived difference in
clarity, sharpness or darkness of alphanumeric characters displayed on a
light background in a darkened room.
Ben Vision Research has
developed an interactive robotic technology for clinical refraction that
serves many advantages to the doctor and the patient in ophthalmic and
optometric settings ranging from private practice to mobile clinics.
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