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Biomedical subjects

D P Choyce

Publications and source records attributed to D P Choyce.

At least 37 records · Page 2Linked to original sources
PubMed1980

Keratoprosthesis.

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Adrenal Cortex Hormones↗
PubMed1979

The evolution of the anterior chamber implant up to, and including, the Choyce Mark IX.

Since 1963, the Choyce Mark VIII lens, a quadrupedal, anterior chamber implant, has proved satisfactory following conventional intracapsular surgery in eyes of normal size, but less successful after primary extracapsular procedures and in small eyes. Reducing some of its dimensions by as much as 30% enables the surgeon to treat a much wider range of cataract problems through a smaller incision. The reduced-size version is known as the Choyce Mark IX anterior chamber implant. The quadrupedal principle has been preserved.

Anterior Chamber↗
PubMed1977

The theoretical ideal for an artificial lens implant to correct aphakia.

In considering the theoretical ideal for an artificial intraocular lens implant to be used in the correction of aphakia it has always been taken for granted that Nature's bioconvex lens is best. But there is some evidence that other configurations may be an improvement. We also have to decide how large it should be and whether it should be placed in front of the iris or behind it. Moreover we have to consider the management of eyes which are already aphakic when first seen and cataractous eyes requiring lens extraction before the pseudophakos can be inserted.

Aphakia↗
PubMed1977

Restoration of binocular vision.

Numerous studies have shown that pseudophakic surgery is a better (because it is a more natural) method of restoring binocularity than contact lenses or aphakic spectacles provided that the potential for binocular vision was present before the onset of the cataract(s). However, this restoration is achieved more easily in some groups of patients than others. Unilateral: Excellent prognosis for binocularity is retained for many years--even 50-60 years--in adult unilateral traumatic cataract/aphakia. At the other extreme are patients born with one normal eye and the other containing a well-marked cataract. In unilateral traumatic cataract/aphakia in children the potential for restoration of binocularity is related to age--the older the child, the better the chances. To achieve binocularity central vision must not fall below 20/70 in each eye. Bilateral: There is not much to choose between pseudophakia and contact lenses; both are effective in restoring binocularity, and both are superior in this respect to cataract spectacles of keratophakia.

Adolescent↗