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 AUTO REFRACTOR |
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REF/KEROMETER |
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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.
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A keratometer, also known as a ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism. It was invented by the French ophthalmologist Samuel Hankins in 1880. Using the relationship between object size (O), image size (I), the distance between the reflective surface and the object (d), and the radius of the reflective surface (R). If three of these variables are known (or fixed), the fourth can calculated using the formula |
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| VEIW TESTER |
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DIGITAL PD METER |
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A phoropter (or phoroptor) is an instrument commonly used by optometrists and ophthalmologists during an eye examination to measure an individual's refractive error and determine his or her eyeglass prescription. Typically, the patient sits behind the phoropter, and looks through it at an eye chart placed at optical infinity (20 feet or 6 metres), then at near (16 inches or 40 centimetres) for individuals needing reading glasses.
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In the most common sense, a Pupilometer is a tool for measuring pupillary distance (PD). It is used for fitting eyeglasses so that the lenses are centered in the visual axis. This is the most common nomenclature.It may also be used to verify a PD measurement taken from a millimeter ruler placed across the bridge of a patient's nose for distance and near focus. |
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| CHART PROJECTOR |
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POWER TABLE |
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| With high luminance halogen lamp and a new optical system, the projected test chart is extremely bright and easy to read, possible to use even in brightly lit room. Vertical series, horizontal series, single character, red/green and masks are built-in. The operator can program the testing procedure so that the test itself can be advanced or returned with a single button. Two different programs each with 31 steps can be stored, allowing greater versatility in selecting the best test for the patient. |
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Power table with connector for instrument,has great stability,lower gravity center. |
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| SLIT LAMP, |
TONOMETER |
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SIGHT LIST |
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| The slit lamp is an instrument consisting of a high-intensity light source that can be focused to shine as a slit. It is used in conjunction with a microscope. The lamp facilitates an examination which looks at anterior segment, or frontal structures, of the human eye, which includes the eyelid, sclera, conjunctiva, iris, natural crystalline lens, and cornea. The binocular slit-lamp examination provides stereoscopic magnified view of the eye structures in striking detail, enabling exact anatomical diagnoses to be made for a variety of eye conditions. |
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Eye Charts display several rows of optotypes (test symbols), each row in a different size. The person is asked to identify the numbers or letters on the chart, usually starting with large rows and continuing to smaller rows until the optotypes cannot be reliably identified anymore.
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