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Biomedical subjects

J L Tennant

Publications and source records attributed to J L Tennant.

8 recordsLinked to original sources
PubMed1979

Removal of intraocular lenses.

The following points should be considered regarding removal of an IOL: 1. Be sure that it is an offending agent and not an innocent bystander before deciding to remove it. 2. An offending IOL may usually be replaced with an anterior chamber lens, with excellent results. 3. Removal of an IOL is usually a difficult procedure in less-than-satisfactory circumstances, and should be undertaken only by an experienced implant surgeon, with special attention to the delicate nature of the patient's eye and emotional feelings about this dilemma. 4. Every effort should be made to perform maneuvers in a closed system with minimal opening and folding of the cornea and minimal irrigation of the anterior chamber. 5. An offending IOL should be removed and replaced with an appropriate lens before irreversible damage has been done to the eye, if at all possible.

Anterior Chamber↗
PubMed1977

Results of primary and secondary implants using Choyce Mark VIII lenses.

The author's experiences with the Choyce Mark VIII implant have been statistically reviewed. The results reveal no significant increase in complications over standard cataract extraction without implantation. Secondary implantation is compared with primary implantation. The results seem to support the author's position that secondary implantation with the Choyce lens carries a 3-5% incidence of complications which must be weighed against the patient's need for further rehabilitation. The importance of fixation in implantation has been reviewed from an historical standpoint to support the conclusion that the Choyce lens owes much of its superior results to its ideal fixation and lack of pseudophakodonesis.

Aged↗
PubMedDate not supplied

Forward light scatter at one month after photorefractive keratectomy.

BACKGROUND: Although it is known that backward light scatter increases transiently following most excimer laser photorefractive keratectomies (PRKs), it is not clear that there is a significant increase in forward light scatter, which is of primary concern for the patient. The object of this study was to determine if there is a significant change of forward light scatter at 1 month after (PRK) with an ablation zone diameter of 6 mm. METHODS: Overlapping subsets of 24 normal myopic eyes were tested before (on the day of surgery) and 1 month after PRK, using three instruments: a Stray Light Meter (16 eyes); a Computerized Stray Light Meter (14 eyes); and a mesopic Increment Threshold-Glare Paradigm (six eyes). Differences between the two eyes before PRK were compared with the differences between the same eye before and after PRK, using repeated measured analysis of variance. In addition, increment threshold data obtained from 22 eyes after PRK were compared with those of 60 controls of the same age range and distribution by a t test. RESULTS: None of the statistical comparisons approached significance at the alpha = 0.05 level. Changes in light scatter as small as a factor of 1.95 (Stray Light Meter) and 1.55 (Increment Threshold-Glare Paradigm) could be detected as significant with a high power (0.8). Changes larger than a factor of 21 could be detected with a power of 0.8 for the Computerized Stray Light Meter. CONCLUSIONS: In these data, there is no support for the hypothesis that forward light scatter increases significantly 1 month after PRK with an ablation zone of 6 mm. Any increases in forward light scatter are unlikely to be greater than a factor of 1.5 to 2 under daytime or nighttime illumination conditions.

Adult↗