Medical LED (light emitting diode) vision test instrument

Abstract

The invention relates to a vision test chart, a vision chart back lighting technology, a vision chart control system and an LED (light emitting diode) solid state lighting energy saving technology, in particular to a medical LED (light emitting diode) vision test instrument. The medical LED vision test instrument has the technical scheme that the medical LED vision test instrument comprises a sighting target plate, light sources, a main body machine case and an auxiliary protecting cover, wherein a plastic cement case is adopted as the main body machine case, the plastic cement case and a bottom plate form a main body sealed case of the test instrument, the main body sealed case mainly provides the protection and support effects for the vision test instrument, the light sources are a plurality of LED light sources which are uniformly distributed in the main body machine case and are arranged on a base plate, and the protecting cover is made of transparent acrylic materials. The medical LED vision test instrument has the beneficial effects that on the basis that the test functions are various, and the surface brightness of the sighting target plate is uniform and constant, the effects of remote operation, portability, simplicity, energy saving and the like are further realized, so better use prospects are realized.

Description

technical field [0001] The invention relates to a vision test chart, a vision chart backlighting technology, a vision chart control system and an LED solid-state lighting energy-saving technology, in particular to an LED medical vision tester. Background technique [0002] Existing eye charts usually have a common paper structure. Since the visual acuity of the human eye is also related to the brightness and contrast of the recognized object, it is necessary to cooperate with external auxiliary light to ensure a relatively uniform recognition brightness on the visual acuity chart. The lighting on the market now mainly uses ordinary fluorescent tubes or CCFLs as the backlight, so the brightness uniformity of the vision chart is not very high. [0003] Now the common vision chart is mainly used to detect myopia and hyperopia, but with the development of society, people also put forward higher requirements for vision detection, including color blindness, color weakness, astigm...

AI Technical Summary

Problems solved by technology

The lighting in the market now mainly uses ordinary fluorescent tubes or CCFL as the backlight, so the recognition brightness uniformity of the eye chart is not very high.

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