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IOLVIP
The Intraocular Lens for Visually Impaired Patients (IOLVIP or IOL-VIP) is an intraocular lens system aiming to treat patients with poor central vision due to age related macular degeneration. The IOLVIP procedure involves the surgical implantation of a pair of lenses that magnify and divert the image using the principals of the Galilean telescope.〔http://www.nice.org.uk/nicemedia/live/11921/40489/40489.pdf〕 By arranging the lenses it is possible to direct the image to a different part of the eye than the fovea, which is the centre of the macula and is usually used for detailed vision. The magnified image is projected on to a part of the eye not normally used for detailed vision. Magnification and patient training are both necessary to allow useful vision from this part of the retina.
It is a procedure to give symptomatic relief rather than treat disease and is best understood as an implanted miniature telescope.〔http://www.nice.org.uk/nicemedia/live/11921/41746/41746.pdf〕
The procedure was pioneered in Italy and has since been taken to the UK and USA. It should not be used in anyone with active (that is changing) macular degeneration.〔http://kasaby.co.uk/IOLVIPQA.aspx〕 It can be used in both "burned out" wet macular degeneration and in dry or atrophic macular degeneration. A telescopic simulator can be used to assess whether the surgery might be helpful, and to establish the best rotation for the two lenses.〔http://www.sapphire-eyecare.co.uk/IOL/understanding.htm〕
There are few clinical studies on this or related systems.〔http://www.ncbi.nlm.nih.gov/pubmed?term=%22Macular+Degeneration%2Frehabilitation%22%5BMesh%5D+AND+%22Lenses,+Intraocular%22%5BMesh%5D〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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