A psychophysical measurement method of object-image anisotropy based on interocular contrast regulation

Abstract

The invention discloses a psychophysical measurement method for object-image inequality based on the control of the contrast between the two eyes, which includes the following steps: 1) under the condition of simulating binocular separation, the left and right eyes respectively present different sizes of optotype graphics, and the subject After comparing and adjusting the subjective size of the two graphic objects to be equal, calculate and measure the actual size difference between the two graphics, and repeatedly measure the actual size difference between the two graphics. 2) Regulate the contrast between the two eyes to measure the anisotropy of amblyopia patients and patients with simple anisometropia, and compare the differences in the measured values ​​of anisotropy under different contrast conditions. 3) By adjusting the brightness of the background, compare the measurement difference of the object image value under different background brightness. The present invention comprehensively evaluates the size difference between the two eyes of patients with anisometropic amblyopia and patients with simple anisometropia in combination with the characteristics of contrast regulation between the eyes, so as to obtain unequal image values.

Description

technical field [0001] The present invention relates to the field of ophthalmology measurement, and more specifically, to a psychophysical measurement method based on object-image anisotropy controlled by the contrast between two eyes. Background technique [0002] Aniseikonia refers to the phenomenon that the left and right eye images are not equal in size. It is generally believed that an aniseikonia of 3%-5% can cause difficulties in binocular fusion and obstacles to stereo vision in normal people. When the imaging difference between the two eyes is too large to cause fusion difficulties, it is called pathological anisotropy. Pathological anisotropy not only hinders the establishment of normal binocular vision, but also causes a series of adverse visual symptoms. Anisometropia is an important reason for the occurrence of anisotropy, and the anisotropy will become more significant as the degree of anisometropia increases. In addition to pure anisometropia, which account ...

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Problems solved by technology

At the same time, in actual clinical work, it is usually difficult for us to immediately distinguish the nature of an anisometropic patient's aberration. Even if it can be clearly distinguished by inspection, some patients may have mixed factors of axial and refractive at the same time, so a single According to Knapp's law or the practice of giving contact lenses regardless of the patient's actual situation is not scientifically rigorous enough

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