visual function

The Relationship Between Accommodation and Convergence: CA/C and AC/A and Their Examination Methods

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The Relationship Between Accommodation and Convergence: CA/C and AC/A and Their Examination Methods

1. Interaction Between Accommodation and Convergence The neural impulses for accommodation are obtained through a negative feedback mechanism, which refers to the process of reducing the stimulus that triggers this response through dynamic reactions. For example, when shifting focus from distant to near targets, the initial image on the retina is out of focus, resulting … Read more

Common Visual Function Testing Devices and Training Equipment (Including Functions and Principles)

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Common Visual Function Testing Devices and Training Equipment (Including Functions and Principles)

Visual Function Testing Devices Visual Acuity Examination Instrument Function Principle: This device can test most of the visual functions required in clinical practice, not just visual acuity. The test results can show whether the subject’s eyes can coordinate, whether there is simultaneous perception, fusion, whether the eye position is normal, whether the vision is normal, … Read more