Low-illumination focus-adjustable indirect ophthalmoscope

Abstract

The invention discloses a low-illumination focusable indirect ophthalmoscope, and belongs to the field of indirect ophthalmoscopes, the low-illumination focusable indirect ophthalmoscope comprises an illumination system and a microscopic system, the illumination system is located on one side of the microscopic system, the illumination system is used for projecting light spots to an observed object, the microscope system is used for observing the observed object, the illumination system is configured to be a weak light source illumination system, the microscope system comprises an objective lens, an eyepiece unit and an image intensifier, the eyepiece unit comprises a focusing eyepiece, and the image intensifier is located in front of or behind the focusing eyepiece. According to the low-illumination focus-adjustable indirect ophthalmoscope, a low-illumination weak light source illumination system can be used, the defect that an examinee feels uncomfortable due to the fact that incident light is too strong in the prior art is fundamentally overcome, digital images can be collected in real time, teaching and computer graphic analysis are facilitated, in addition, the indirect ophthalmoscope further supports continuous zooming, and adjustment of magnification times is more flexible.

Description

technical field [0001] The invention relates to the field of indirect ophthalmoscopes, in particular to a low-illuminance adjustable focus indirect ophthalmoscope. Background technique [0002] Binocular indirect ophthalmoscope is a commonly used ophthalmic equipment, which is mainly used to check the fundus of patients. At present, the common binocular indirect ophthalmoscope on the market consists of four parts: illumination system, eyepiece system, objective lens and accessories. Among them, the illumination system and eyepiece system are the core components of the indirect ophthalmoscope, and the accessories include transformers, teaching mirrors, etc. Such as figure 1 As shown, it is an existing binocular indirect ophthalmoscope. During specific work, its lighting system emits light that can be linearly adjusted in brightness. circular spot. The light reflected by the fundus passes through the eyeball, and then enters the eyepiece system after passing through the obj...

AI Technical Summary

Problems solved by technology

In addition, before inspecting the eye to be inspected, the mydriasis of the eye is often administered first, which will further increase the light entering the patient's eyes and aggravate the discomfort of the examinee.

[0004] (2) The magnification is not easy to adjust

At present, indirect ophthalmoscopes often need to perform operations such as partial zoom-in or overall zoom-out in practical applications, but since the focal length of a single objective lens is fixed, the fixed focal length will result in a relatively fixed magnification and observation field of view. Usually, the smaller the focal length of the objective lens, the corresponding magnification Bigger gets narrower field of view; and vice versa

Therefore, if the existing indirect ophthalmoscope adopts a single objective lens, it is difficult to meet the operating requirements such as partial enlargement or overall reduction, so the existing indirect ophthalmoscope often needs to be equipped with and constantly replace the objective lens in practical applications to meet the above operating requirements. This is not only cumbersome to use but also more costly to maintain with multiple lenses

[0005] (3) The existing indirect ophthalmoscope can only perform ordinary imaging observation, and cannot support image storage and teaching

The above-mentioned binocular indirect ophthalmoscope can eliminate the strong reflected light of the objective lens and cornea and other reflected stray light interference through the polarizing component, but this method can only treat the symptoms but not the root cause, and it is difficult to truly solve the problem of patient discomfort caused by strong incident light

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