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Autorefractometer
Instrument for measuring the refractive state of the eye. There are two main types of optometers:
Subjective:
Optometers rely upon the subject's judgment of sharpness or blurredness of a test object while
Objective:
Ones contain an optical system which determines the vergence of light reflected from the subject's retina. Electronic optometers in which all data appear digitally within a brief period of time after the operator has activated a signal can be of either type. Objective types also called autorefractors or autorefractometers have become very popular and several of these autorefractors are now providing both objective and subjective systems within the same instrument. Autorefractometers Contains Humphrey Vision Analyzer; auto refraction; infrared optometer; photo refraction; refractive error.
Auto refractors are machines that automatically determine the correct lens prescription for your eyes. If you've discovered you might need vision correction during your eye examination, it's vital to determine just how much your eyes need to be corrected with lenses or contact lenses. This is called measuring your refraction. Auto refractors automatically measure this value during an eye examination. While seated with your chin in a stabilizing chinrest, you'll be asked to focus on an image or point of light. The auto refractor automatically determines the correction needed to place your focus point on top of the retina, the light-sensitive area at the back of the eye responsible for correctly processing images.The measurement taken by an auto refractor can be translated into a prescription for eyeglasses.
In eye exams for small children, or for people with special needs who may have trouble sitting calmly during an extended exam, or verbally describing their vision problems – auto refractors give highly accurate measurements used to determine vision correction needs, automatically.
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