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The Main Features Of Optometry Equipment

Optometry instrument principle and precautions: optometry instrument is an electronic objective optometry equipment, is the combination of refractive technology and electronic computer technology products. There is no need for the subjective judgment of the clinician and the subject, and the refractive parameters are evaluated objectively by the pre-set criteria. As the computer optometry simple, fast, Optometry Instruments short learning cycle, suitable for rapid access to objective diopter and as the main refraction of the starting point or for daily eye care screening. With the application of high-tech optometry equipment, the accuracy of optometry equipment has been greatly improved, many instruments integrate corneal curvature or corneal topography function, and some manufacturers of instruments and integrated refractometer automatically online, The results directly into the integrated refractometer, easy to use; Optometry Instruments portable optometry equipment can also be used in the surgical process and screening.

The principle of computer optometry most of the optometry instrument design principle based on indirect eyepiece, the use of two objective lens or focusing mirror and a beam splitter, the light source directly from the pupil edge into the detection of the cursor can move along the projection system, Optometry Instruments The focus of the projection lens, the image will be at infinity, then in the eyes of the retina on the clear focus; if the eye was eye refractive error, the detection of the cursor before and after the move, making it focused on the retina, most of the optometry The instrument automatically calculates the refractive power of the eye by changing the light's divergence into the eye to make the cursor clearly imaged on the retina.

Modern optometry instrument design usually has two main features:

1. Regulatory control For most optometry methods, regulatory control is particularly important. Almost all of the refractors require the subject to watch the test cursor or cursor image, the results stimulate the adjustment and make the results of myopia correction or hyperopia correction, although the test cursor through the optical design at infinity,

As the instrument is very close to the subject's face, Optometry Instruments it induced the near-perceived regulation, so in the design process, the test cursor "fog visual", before the start of the measurement, the subjects first see a "fog as" Cursor, in order to relax the regulation, but can not completely remove the near-perceived regulation.

2. Detection of light for the infrared light currently used in the detection of optical instruments are used to detect the wavelength of 800 ~ 950 nm infrared light. The reasons are: ① infrared absorption by the intraocular tissue is less visible light, the reflection of the light through the fundus more. Therefore, the detection of light through the intraocular vector after the loss of light energy less, Optometry Instruments especially the measurement of refractive media cloudy eyes is more important. ② for the eye, the detection of visual and detection of light is not visible, better to overcome the measurement caused by the adjustment of the problem. Due to the different production companies, optometry instrument design and structure are different, the inspectors in the use of optometry equipment before the need to read the instructions in detail. The common structure of the optometry instrument is: ① the cursors watched by the examiner. ② can adjust the jaw and head, so that the inspection process of the patient's head position fixed. ③ joystick can be before and after, up and down, left and right movement to adjust and adjust the location of the subject's eyes. ④ monitor shows the location of the eye and the measurement results. ⑤ printing device.