What is the abnormal retinal correspondence?

Background: Anomalous retinal correspondence (ARC) is a neural adaptation to eye misalignment in which non-corresponding retinal points are linked in the visual cortex to provide binocular fusion.

Is retinal correspondence normal?

Normal retinal correspondence (NRC) means the eyes are correctly positioned, with both eyes looking in the same direction, with no eye turn. In NRC, the central part of the retina of each eye, known as the fovea, is correctly positioned and sees the images the person is looking at.

What is cyclopean eye?

During binocular fixation, the eyes usually point in different directions, and yet, each object is judged to lie in a single direction. It is commonly believed that a particular location in the head serves as the origin for such directional judgments. This location is known as the cyclopean eye.

What are disparate retinal points?

Corresponding retinal points are points stimulated on the retina that give rise to the same visual direction. When objects stimulate non-corresponding points, this gives rise to different visual directions. These retinal points are called disparate points.

Can convergence insufficiency cause headaches?

Convergence insufficiency refers to a common near-vision problem that interferes with your ability to read and work at close distances. As with strabismus, convergence insufficiency can cause chronic headaches.

Is strabismus a disease?

Strabismus is a disorder in which both eyes do not line up in the same direction. Therefore, they do not look at the same object at the same time. The most common form of strabismus is known as “crossed eyes.”

What is cyclopean concrete?

Cyclopean concrete derives its name from this ancient method. It is a form of massed concrete in which stones are placed as the concrete is poured. These are called plums or pudding stones and are 100 pounds (45 kg) or more in weight.

Is retinal disparity good?

Retinal disparity is important in gauging how far away objects are. The more difference (or greater disparity) between the image each eye has of the same object, the closer it is to you. The farther away an object is, on the other hand, the more similar it looks from viewing it with each eye alone.

What is crossed and uncrossed disparity?

Uncrossed disparity causes the images on both retinas to move nasally relative to the location of images of objects on the horopter, whereas crossed disparity does the opposite. Objects closer than the horopter will move temporally on both retinas, compared to objects on the horopter.

What is Horopter in binocular vision?

The horopter is the locus of points in space seen singly by the two eyes. The Cyclopean eye is an abstract eye that represents the visual axes of the two eyes by a single axis of perceived direction.