The Fresnel prism is usually only required over one lens. It does not matter which eye looks through the prism. Most people prefer to have it in front of their worst seeing eye. Using a Fresnel prism will not make your eye weaker, strain the other eye or stop the double vision improving.

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If you are discharged from the eye department with a Fresnel prism then your local optometrist will be responsible for ordering a new prism if it needs replacing. You do not need to contact the eye department.

If you immediately experience double vision when you put the glasses on, it may be that the prism in on the wrong lens or is the wrong way round.

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If the double vision is improving but still present when not looking through the prism, continue with the prism until your next appointment.

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If you feel your double vision has resolved you can remove the Fresnel prism from the glasses by placing your finger nail under the edge and peeling it off. Please contact the orthoptic department for further advice.

Long-term the Fresnel prism may be changed to a permanent prism which is built into a pair of glasses and has the advantage that there is no blurring effect.

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Occasionally a very strong prism is required which is too strong to be built into glasses. In this instance a Fresnel prism may be used in addition to or instead of a permanent prism.

It is generally applied to one lens (occasionally both lenses) of your glasses . The prism adheres to the lens by suction, using water.

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This information aims to answer some of the frequently asked questions about the use of Fresnel prisms for double vision (diplopia).

Generally, the Fresnel prism will only control the double vision when you are looking straight ahead. You may still get double vision when you look in other directions. Your symptoms will only be controlled when the prism is worn.

This is different for every person. If your double vision improves then the strength of the prism will gradually be reduced at each appointment.

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Generally the prism is worn until the double vision improves completely, or until it has been stable for approximately six months and a more permanent solution is required.

You will have a full sight test carried out by a hospital optometrist (optician) and will be given a prescription to take to a local optometrist of your choice to have glasses made up.

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The prism may be applied to the entire lens or just a portion of it. If you use bifocals or varifocals you may need different strengths of prism on the reading and distance sections.

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Yes, you may notice some slight blurring or distortion of your vision and possibly some rainbow effects in bright light. The stronger the prism, the more you are likely to notice this.

PALS (Patient Advice and Liaison Service) for help, advice and information about NHS services. You can contact them on free-phone 0800 032 02 02, e-mail the North of the Tyne PALS department or text to 07815500015.

If you would like further information about health conditions and treatment options, you may wish to have a look at the NHS website.

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