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A prism is a wedge-shaped piece of glass or other transparent material, which deflects rays of light toward the base. It is routinely used in orthoptic practice to measure the size of a squint (how much the eye turns in or out) and can be used to redirect the rays of light onto the correct point of the back of the eye.

FresnelLight

A fresnel prism is a thin transparent plastic sheet which induces a prismatic effect (it alters the direction of the image entering the eye). One side has a series of angular grooves (prisms), and the other smooth side is attached to the lens of your glasses.

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They have to be fitted onto a glasses lens. If you do not need glasses to correct your eyesight, a pair can be made up with plain glass.

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This leaflet has been given to you by your orthoptist, who has suggested that a fresnel prism may be the best treatment for you at this stage.

How long a prism is needed depends upon your individual needs and your eye condition. Sometimes a prism is needed for several months, but the strength of it changes as your eye condition stabilises.

FresnelLens Sheet

If you have any further questions or concerns, please contact your local Orthoptic Department, where your prism was fitted, at any time to discuss your worries or concerns with the orthoptist treating you.

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You do not usually need to remove the prism from your glasses to clean it, just wipe it with a lens cloth. If the fresnel prism becomes dirty it can be removed and cleaned with a soft toothbrush and soapy water and reapplied.

There are many reasons for using a fresnel prism. Your orthoptist will discuss with you the reason why you have been advised to use one. The most common reasons are to:

Any complaints, comments, concerns or compliments, please speak to a member of your healthcare team. Or contact the Patient Advice and Liaison Service on 01227 783145 or email.

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Patients should not bring large sums of money or valuables into hospital. Please note that East Kent Hospitals accepts no responsibility for the loss or damage to personal property, unless the property has been handed into Trust staff for safe-keeping.

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Your orthoptist will fit the prism to your glasses using water. If you have your glasses with you, they will do this during your orthoptic appointment, and give you instructions on how to clean and care for your glasses / prism.

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If you have any accessibility needs; this includes needing a hearing loop or wanting someone to come with you to your appointment.