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Accommodation reflex is a reflex action of the eye to focus on near and distant objects by changing lens shape, pupil size and vergence. Learn about the neural circuit, pathway and mechanisms of this reflex, and how it differs from presbyopia.
Convergence insufficiency is a binocular vision disorder that affects the ability of the eyes to turn towards each other. It can cause symptoms such as double vision, eye strain, headache, and difficulty reading. Learn about the diagnosis, treatment, and prevalence of convergence insufficiency.
The Brock string is commonly employed during treatment of convergence insufficiency and other anomalies of binocular vision. It is used to develop skills of convergence as well as to disrupt suppression of one of the eyes. [1] During therapy, the one end of the Brock string is held on the tip of the nose while the other is tied to a fixed point.
Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies. Learn about the different mechanisms of accommodation in animals living in air, water and both environments.
Both of these mechanisms are neurally linked forming the accommodation-convergence reflex [1] of eyes. One can distinguish vergence distance — a distance of a point towards which both eyes are converging, and an accommodation distance — a distance of a region in space towards which the focus or refractive power of the ...
As a consequence, no compensatory eye movement is generated, and the patient cannot fixate a point in space during this rapid head movement. The head impulse test can be done at the bed side and used as a screening tool for problems with a person's vestibular system. [25] It can also be diagnostically tested by doing a video-head impulse test ...
A cover test is an objective determination of the presence and amount of ocular deviation, such as strabismus or phoria. It involves covering and uncovering one eye while observing the movement of the other eye with a fixation target at different distances.
Suppression of an eye is a subconscious adaptation by a person's brain to eliminate the symptoms of disorders of binocular vision such as strabismus, convergence insufficiency and aniseikonia. The brain can eliminate double vision by ignoring all or part of the image of one of the eyes.