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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 abilities which involve the use of hands develop over time, starting with primitive gestures such as grabbing at objects to more precise activities that involve precise eye–hand coordination. Fine motor skills are skills that involve a refined use of the small muscles controlling the hand, fingers, and thumb.
Accommodative insufficiency is the inability of the eye to focus properly on near objects. It can be caused by systemic or local factors, and may be treated with lenses, exercises or surgery.
An autostereogram is a two-dimensional image that creates the optical illusion of a three-dimensional scene. Learn about the history, types, and viewing techniques of autostereograms, and how they differ from stereograms and binocular vision.
Thoracic outlet syndrome (TOS) is a condition in which there is compression of the nerves, arteries, or veins in the superior thoracic aperture, the passageway from the lower neck to the armpit. TOS can cause pain, weakness, swelling, discoloration, and other symptoms in the upper limbs and may be related to trauma, repetitive movements, tumors, or anatomical variations.
Brown's syndrome is a rare eye disorder that limits upward gaze due to a malfunction of the superior oblique muscle. It can be congenital or acquired, and may require surgery or other treatments to correct the strabismus or visual symptoms.
Motor coordination is the orchestrated movement of multiple body parts to achieve intended actions. Learn about its properties, such as large degrees of freedom and complexity, and its types, such as inter-limb, intra-limb, and eye-hand coordination.
Median nerve palsy is a nerve disorder that affects the muscles and sensation of the hand. It can result in ape hand deformity, where the thumb cannot oppose or abduct, and sensory loss in the fingers. Learn about the causes, diagnosis and treatment of this condition.