Which term describes the simultaneous inward movement of both eyes toward each other to maintain single vision?

Answer 1

The simultaneous inward movement of the eyes is known as convergence. When both eyes are aligned onto a target, the brain should perceive a single image. Slight inaccuracies in convergence can cause a person to see double vision, or diplopia. Because the convergence visual system is also tied to the focusing system, many people who have problems with convergence also have problems with focusing and thus have blurred vision. This linkage between focusing and convergence is known as accommodative conververgence.

If the eyes cannot converge accurately to achieve single vision, usually the person will have a convergence insufficiency, convergence excess, or strabismus. Convergence insufficiency means that the eyes do not turn inwards enough to lock onto a target usually up close. This will result in double vision, difficulties in reading, and poor reading comprehension particularly in school-aged children who are not treated or are never diagnosed because they assume it is normal.

Convergence excess is when the eyes turn in too much. Symptoms can be quite similar to convergence insufficiency except the treatment is more challenging. The gold standard for treatment for both convergence insufficiency and convergence excess is vision therapy or orthoptics. This involves exercises and activities to improve muscle coordination and focus through a doctor-directed therapy program. The duration of treatment varies on the patient's age and the severity of the condition. On the otherhand, strabismus refers to eyes that are misaligned even while looking straight ahead and not just the inward movement of the eyes. Treatment for strabismus can include just getting a pair of glasses, to adding prism to your lens correction, vision therapy, and eye muscle surgery if the other options are unsuccessful.

Answer 2

Convergence