The NIDEK REFRACTOR Model RT-3100 is a computerized refractor used for subjective refraction with the NIDEK AUTO REFRACTOMETER (AR), AUTO REF/KERATOMETER (ARK), AUTO REF/ KER/TONOMETER (RKT), or AUTO LENSMETER (LM) via Eye Care card. The RT-3100 includes a refractor head, control box, and relay box. The relay box not only connects the other two units, but also connects the Chart Presenting device or PC. The control box includes the key panel, display, and printer. The display is a touch-screen panel. The control box displays the data and can be used for almost all operations. In addition, the control box operates the refractor head and the connected chart presenting device. It allows the refractor and charts to be controlled together. Normally, the relay box is installed on the system table (not included in the RT-3100 package.)
A mechanical ophthalmic device that is used during an ophthalmic examination; typically to determine a patient's prescription for glasses. It consists of two large, disk-like housings, joined together, that each contain a built-in paternoster works consisting of a large number of different lenses of differing strengths used to measure the refraction of the eye; it is a mechanized set of trial lenses. It is placed in front of the patient's eyes and viewing through the phoropter the patient is asked to read a Snellen eye chart placed at a preset distance. The optometrist changes the lenses and other settings, while asking the patient for subjective feedback on which settings give best vision.
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