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Method and system for natural and objective assessment of view function

A technique for objective assessment and visual field, applied in the system field of visual field function assessment, which can solve the problem of erroneously estimating the effective visual field of subjects

Active Publication Date: 2018-01-09
INST OF PSYCHOLOGY CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the traditional perimetry is operated, it presents visual stimuli (usually light spots) in different visual field positions, allowing the subjects to judge whether they see the presented light spots, which is highly subjective.
Especially for the damaged field of view, still need to make a subjective response, may misestimate the effective field of view of the subject
For severely damaged visual fields, subjects often subjectively report not seeing any stimuli, but subjects are still required to report whether stimuli appear in the damaged visual field, which is obviously not a natural way of measurement

Method used

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Examples

Experimental program
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Embodiment 1

[0050] This implementation uses the visual field function natural and objective assessment system provided by the present invention to measure the visual field function of normal people.

[0051] According to the measurement field of view and the cut-off spatial frequency of the subject, a sinusoidal grating with a spatial frequency of 10 degrees per degree (cpd) was determined as the masking stimulus. When MSR=0, 0.5, 0.6, 1, 0.8, 1.0, 1.25, At 1.6 or 2, measure the discrimination thresholds of central visual field, left visual field and right visual field respectively.

[0052] The specific measurement process is as follows:

[0053] (1) The display unit presents the central fixation point and successively presents the sample stimulus visual target, the masking stimulus visual target and the test stimulus visual target respectively, wherein each visual target presents a duration of 380 milliseconds, and the time between every two visual targets The time interval is 1500 mil...

Embodiment 2

[0061] In this implementation, the system for natural and objective assessment of visual field function provided by the present invention is used to measure the visual field function of the subject.

[0062] The subjects were 5 subjects with impaired visual field function.

[0063] When MSR=0, 0.5, 0.6, 1, 0.8, 1.0, 1.25, 1.6 or 2, the discrimination thresholds of the ipsilateral or contralateral presentation of the optotype were measured respectively.

[0064] The specific measurement process is as follows:

[0065] (1) The display unit presents the central fixation point and successively presents the sample stimulus optotype, the masked stimulus optotype and the test stimulus optotype respectively, and the optotype is presented on the same side or on the opposite side, wherein each optotype presents The duration is 380 milliseconds, and the time interval between each two visual targets is 1500 milliseconds. The sample stimulus visual target and the test stimulus visual targ...

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Abstract

The invention provides a system for natural and objective assessment of a view function. The system comprises a host control unit, a display unit and a human-machine interactive unit, wherein the hostcontrol unit comprises a computing module, a judgment module, an adjustment module and a storage module; and the human-machine interactive unit comprises a receiving module and a feedback module. Thesystem for the natural and objective assessment of the view function is characterized in that a visual masking technology in a visual psychophysics basic research is changed and the system for the natural and objective assessment of the view function is provided for a testee, so a function level of a view can be assessed quantitatively. The system can be widely generalized to neuro-ophthalmic clinical diagnosis.

Description

technical field [0001] The invention relates to a system for visual field function evaluation, in particular to a system for natural and objective evaluation of visual field function. Background technique [0002] Field of view refers to the spatial range in which the subject's eye (single or both eyes) can find the target when it is fixed. Harm, at the same time will bring huge losses to the social economy. [0003] The traditional visual field test uses the average light sensitivity of the retina as an index, and is mainly used to realize early identification and diagnosis of routine ophthalmic diseases such as glaucoma and macular degeneration. The existing perimetry is mainly divided into two types, one is the dynamic perimeter (kinetic perimeter), which projects light points into the interior of a semi-arc sphere, and gradually presents the light points from the outer periphery to the center of the field of vision until the affected area The subject can see the dots o...

Claims

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Application Information

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IPC IPC(8): A61B3/024
Inventor 黄昌兵邱怀雨何勍
Owner INST OF PSYCHOLOGY CHINESE ACADEMY OF SCI
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