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Strabismus hook: muscle hook or squint hook; sharp tip or knobbed tip; used in squint surgery Foreign body spud and needle: Spud to remove superficial and needle for the deep foreign bodies in the eye Elliot's trephine with handle: used in corneal donation (eye donation) to cut out the cornea in a circular fashion Castroveijo's calipers
Depending on the person and the details of their case, a pair of glasses in the right prescription may be all that’s necessary to straighten vision and address strabismus, Flanary says.
Orthoptics has a long history in supporting ophthalmic care. French ophthalmologist Louis Emile Javal began using ocular exercises to treat strabismus (squint) and described the practice of orthoptics in his writings in the late 19th century. Mary Maddox pioneered the orthoptic profession and was the first documented orthoptist.
The patient wears red-green glasses, and two lights (one red, one green) are used, so that the patient thus sees each light with a different eye. One light is held by the clinician, the other by the patient. The clinician points the light to a screen, requesting the patient to bring the second light to align on top of it.
Some cases of convergence insufficiency are successfully managed by prescription of eyeglasses, sometimes with therapeutic prisms. Pencil push-ups therapy is performed at home. The patient brings a pencil slowly to within 2–3 cm (0.79–1.18 in) of the eye just above the nose about fifteen minutes per day five times per week.
The prismatic lenses of the belay glasses are arranged so as to bend light from above through total internal reflection into the observer's eye, allowing the belayer to observe the climber while maintaining a comfortable head/neck position. The design based on the eyeglasses frame provides for a split field of vision:
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