Loose Prism Set

Prisms are used in diagnosis and Therapy of Ophthalmic disorders. Prismotherapy provides symptomatic relief not only in many kinds of squints, but also in non strabismic conditions like convergence insufficiency, nystagmus, heminopia etc. One of the most important therapeutic skill we have acquire in this direction, is the localisation of such clinical needs and the timely use of the wonderful therapeutic functions of prisms for the relief of such conditions. Thin Fresnel prisms are now more used in clinical practice.
How Prisms Function
Prism is a transparent, solid, triangular refracting medium with a base and apex. Its apical angle determines the power of prism. A prism of one prism diopter power (� ) produces an apparent displacement of one centimeter to an object situated one meter away. Light entering the prism will deviate toward its base. However, image appears shifted to the apex, and the eye examined or treated tend to deviate toward its apex. This is how prisms function and manipulate the special location of image clinically.

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