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Optometry Instrument Is Electronic Optometry Equipment

Optometry instrument is the electronic objective optometry equipment, is the refractive inspection technology; First, the principle of computer optometry; Most of the design principles of optometry instruments are based on indirect fundus mirrors, which are used; modern optometry instrument design usually has two main characteristics:; 1. Regulation control for most optometry methods, the regulation of the control is particularly heavy; because the instrument is very close to the person who is seized; the face, it induces the near-perceptual regulation, Optometry Instruments therefore in the design process, will; 2. Detection of optometry instruments used in infrared light at present Optometry Instrument is an objective optometry equipment, which is the product of the combination of refractive inspection technology and computer technology. Measurement without the subjective judgment of clinicians and subjects, the objective evaluation of refractive parameters by predetermined criteria. Because the computer optometry is simple, fast, and the learning cycle is short, it is suitable for quick access to objective diopter and as a starting point for primary optometry or for routine eye care screening. Optometry Instruments With the application of high technology in optometry instrument, the accuracy of optometry instrument has been improved greatly, many instruments integrate the function of the corneal curvature meter or the corneal topographic map, Optometry Instruments and the instruments of some manufacturers are automatically online with the integrated optometry instrument, and the measurement results are directly imported into the comprehensive optometry instrument, which is convenient to use.

The design principle of most optometry instrument is based on indirect fundus mirror, using two objective lens or focus mirror and a splitter, the light source is directly entered by the pupil edge, Optometry Instruments the detection cursor can move along the axis of the projection system, the projection lens in the front focal plane, the image will be at infinity, then focus on the retina of the eye squarely; if the eye is not refractive, Optometry Instruments the detection cursor moves back and forth, making it like focusing on the retina, Most optometry instruments are used to automatically calculate the diopter of the eye by changing the degree of light that enters the eye to make the cursor clearly imaged on the retina.

The design of modern optometry instruments usually has two main features:

1. Regulation control is especially important for most optometry methods. Almost all optometry requires the person to gaze at the test cursor or cursor image, which stimulates the adjustment and makes the test results myopic or hyperopia due, although the test cursor is designed to be at infinity in the distance, Optometry Instruments because the instrument is very close to the face of the person who is being examined. Induced near-perceptual regulation, so in the design process, the test cursor "fog visualization", before the beginning of the measurement, the subject saw a "fog" cursor to relax the adjustment, but can not completely remove the near-perceptual regulation.

2. Detection of light for infrared light is currently used by the optometry instrument detection of light using wavelength of 800~ $number nm infrared light. The reason is: ① infrared is absorbed in the eye less than visible light, reflected by the fundus more light. Therefore, it is more important to detect the light energy loss after the light has passed through the intraocular medium, especially the eyes with cloudy refractive media. ② for the eyes, the detection of visual standard and detection of light is not visible, better to overcome the measurement of the problem caused by the visual standard.

Due to the different production companies, the design and structure of optometry instruments are also different, and the inspectors need to read the instructions in detail before using optometry instruments. The common structure of optometry instrument is: ① the cursor that the inspector stares at. ② can adjust the jaw and head to make the patient's head position fixed during the examination. ③ joystick can be moved back and forth, up and down, to focus and adjust the position of the eye of the seized person. The ④ monitor displays the location and measurement results of the inspected eye. ⑤ printing device.