Demonstration of peripheral hemiopic border steps by static perimetry

Area of Science:

• Ophthalmology
• Visual Neuroscience

Background:

• The visual field is not uniformly sensitive.
• Previous studies suggest a step in visual sensitivity at the hemiopic border.

Purpose of the Study:

• To investigate visual field sensitivity in normal eyes.
• To confirm the existence of a visual threshold step at the hemiopic border.

Main Methods:

• Static perimetry was performed on 10 normal eyes.
• Examinations were conducted along a horizontal meridian 60 degrees below the fixation point.

Main Results:

• All participants exhibited greater visual sensitivity in the temporal hemifield compared to the nasal hemifield.
• The study confirmed a distinct visual threshold step at the hemiopic border.
• A greater threshold was specifically noted at the hemiopic border.

Conclusions:

• Normal eyes demonstrate asymmetric visual field sensitivity.
• The hemiopic border is characterized by a specific visual threshold step.