Question

Visual field changes in open angle glaucoma

Answer 1

Field of vision or Visual field is defined as the area that is perceived while fixating one central target. According to traquair’s analogy, visual field is “an island of vision surrounded by a sea of darkness”. It is a 3D hill – peak being fovea and at ground level, it extends ~ 50° superiorly, 60° nasally, 70° inferiorly and 90° temporally.

Normal blind spot is 15° temporal to the fixation and measure 6° wide and 8° high.

Terminologies:

Scotoma: Area of reduced sensitivity surrounded by a more sensitive areaDepression: Area of reduced sensitivity without a normal surroundIsopter: A threshold line joining points of equal sensitivity on a visual field chartFixation: Part of visual field corresponding to fovea centralisCentral field: Portion of visual field within 30° of fixationBjerrum’s area: Central visual field within 25° of fixation

Answer 2

Explanation:

A group of eye conditions that can cause blindness.

With all types of glaucoma, the nerve connecting the eye to the brain is damaged, usually due to high eye pressure.