Exophoria: causes, symptoms and treatment

Verified 06/24/2022 by PasseportSanté

Exophoria is a vision disorder. Due to muscle fatigue, a deviation of the axis of vision may appear. The latter can be easily treated, in most cases, with proper exercises and eyeglasses.

What is exophoria?

Exophoria is a disorder of vision, also called convergence insufficiency. It comes in different forms depending on which muscles are affected and causes visual discomfort. It is one of the heterogeneous states, and is the most common form.

On the other hand, Heterophoria are deviations from the visual axis at rest. These are the forms of intermittent strabismus. It will affect 75% of the population to varying degrees.

Exophoria is a muscular problem consisting of a deviation of the axons of the eyeballs that are divergent (the axes of the eyes move away from each other) and latent (which are not present continuously). It appears only under certain conditions.

In order to move to look in different directions, each of the eyes has six muscles called:

  • Right external ocular motor: to direct the eye outward;
  • Right intrinsic ocular motor: to direct the eye inward;
  • Right lower ocular motor: to direct the eye downward;
  • Right upper eye drive: to direct the eye upward;
  • Large tilted ocular motor: to rotate in the direction of the nose:
  • Small tilted ocular drive: to look toward temples.

When some of these muscles get tired, others can take over and create compensation. In the case of exophoria, the deviation of the eye axis appears only transiently, when compensation does not occur (in the case of fatigue or alcohol consumption, for example).

Exophoria must be distinguished from two other conditions:

  • Exotropia or strabismus in which the deviation of the axes of the eyeballs is constant. It is also accompanied by a disturbance in the vision of the eyes.
  • Esophoria in which the deviation is convergent, that is, the axes of the eyes are close to each other.

Exophoria is one of the conditions that will classically be looked for during an ophthalmological examination, due to its frequency.

Aversion is diagnosed using a test called a screen test. The person is asked to fix a specific point before the screen overlaps the point and the eye.

In a state of euphoria, when the screen is raised, the hidden eye is directed outward. The test is done with one eye and then the other.

Orthotic assessment measures deviation angles and binocular vision capabilities.

What are the causes of exophoria?

Exophoria is caused by overstraining of certain eye muscles. These other muscles force to compensate, resulting in visual strain that leads to insufficient convergence of the eyes.

There is no specific or known reason for its release.

What are the symptoms of orgasm?

The exophoria will force some of the eye muscles to work harder in order to make up for those that are deficient. This can lead to:

  • Mild pain in the eye.
  • Numbness;
  • Heavy eyelid sensation.
  • Increased sensitivity to light.
  • eye strain that can make reading difficult;
  • a burning sensation sometimes associated with tears, red eyes, or even blurry, blurry, or double vision;
  • Dizziness.
  • Headache localized in the forehead or neck.

These symptoms often appear after near vision work and reflect eye strain. However, many cases of exophoria do not have any of these symptoms and are well tolerated because they are not very pronounced.

Exophoria: treatments

In the presence of the above symptoms, it is necessary to visit an ophthalmologist in order to detect a possible euphoria and to institute appropriate treatment.

Wear corrective lenses

To treat exophoria, the patient will have to wear corrective glasses, even if he also has myopia. These lenses will make it possible to compensate for the insufficient convergence and thus provide greater visual comfort.

Ophthalmologist consultation and eye rehabilitation

An ophthalmologist may refer to an orthoptist who specializes in examining, analyzing and treating visual disorders. He will perform an orthodontic examination. He or she can then offer eye rehabilitation exercises to stimulate the muscles in order to improve binocular vision, making it clearer and more comfortable.

Rehabilitation takes place in several stages: during sessions with the orthotist, but also with the help of exercises performed at home to re-learn the eyes to converge correctly. The duration and number of sessions required varies for each individual.

surgery

In some cases, after other treatment options have failed, surgery may be considered.

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