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<a href="http://www.shcantonoptics.com/optometry-instruments/auto-refractometer/" target="_self">Auto refractometer</a> is used to determine an individual’s prescription by measuring how light is affected as it reflects through the eyeball. The process is quick and painless for the patient, and the data ensures a baseline to determine the correct eyeglass or contact lens prescription.
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<span class="ez-toc-section" id="What_is_Autorefractor_keratometer" style="box-sizing: inherit;"></span>What is Autorefractor keratometer?<span class="ez-toc-section-end" style="box-sizing: inherit;"></span>
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Autorefractor/keratometers (ARKs) are computerized devices that provide both refractive testing and keratometry measurements. This allows eyecare professionals to determine both a baseline for the patient’s prescription as well as the curvature of the cornea for contact lenses.
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<span class="ez-toc-section" id="What_is_Autorefractometry" style="box-sizing: inherit;"></span>What is Autorefractometry?<span class="ez-toc-section-end" style="box-sizing: inherit;"></span>
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INTRODUCTION S Refractometry is the estimation of refractive error with a machine, called refractometer or optometer. S Automated Refractometers (AutoRefractors) are designed to objectively determine the refractive error & are of various types depending upon the underlying principle they are based on.
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<span class="ez-toc-section" id="How_does_a_refractometer_work" style="box-sizing: inherit;"></span>How does a refractometer work?<span class="ez-toc-section-end" style="box-sizing: inherit;"></span>
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Refractometers measure the degree to which the light changes direction, called the angle of refraction. A refractometer takes the refraction angles and correlates them to refractive index (nD) values that have been established. Measurements are read at the point where the prism and solution meet.
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Chart Projector
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The <a href="http://www.shcantonoptics.com/optometry-instruments/chart-projector/" target="_self">chart projector</a> is an AC-powered device intended to project an image on a screen for vision testing.
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Ophthalmic examination chart projector including a rotatable chart carrying disc and a mask plate which are co-axial with each other. A light source and a projecting lens assembly are provided for projecting one of the charts on the disc and one of the mask openings onto a screen. An index tube is rotatably mounted in the projecting optical path and carrying a colored filter on the inner periphery thereof. Thus, an astigmatic index can be projected on the peripheral portion of the astigmatic examination chart. The chart carrying disc, the mask plate and the astigmatic index tube can be controlled by knobs all provided on the front panel of the projector.
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Handheld Autorefractors
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There are important applications for a <a href="http://www.shcantonoptics.com/optometry-instruments/handheld-autorefractor/" target="_self">handheld autorefractor</a> in the clinical setting. A portable but powerful handheld autorefractor such as the SVOne (Smart Vision Labs; Figure 1) can be used in place of a desktop unit if, for instance, the desktop unit malfunctions or needs servicing. The SVOne adds flexibility to the clinic because it is transportable. This can improve patient flow dynamics, taking the testing modality to the patient rather than having the patient leave the exam room to go to a testing station. A handheld autorefractor serves to relieve bottlenecks if a testing station is occupied; it also allows clinicians to carry the technology to satellite offices that may not have the same diagnostic equipment as the main office.
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