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Biomedical subjects

R D Bonham

Publications and source records attributed to R D Bonham.

6 recordsLinked to original sources
PubMed1987

Complications of semiflexible, closed-loop anterior chamber intraocular lenses.

Anterior chamber intraocular lenses (IOLs) provided good visual rehabilitation of aphakia in a majority of patients. An increasing number of eyes with closed-loop, semiflexible anterior chamber implants are now being seen with decreased vision due to corneal edema and persistent cystoid macular edema. We evaluated 53 such eyes in 52 patients who presented with decreased vision one to 51 months (average, 15 months) after lens implantation. The most frequent lens implanted was the Surgidev Style 10 Leiske IOL. Surgery for IOL removal or exchange with or without penetrating keratoplasty was performed in 34 (64%) of 53 eyes; visual acuity recovery ranged from 20/20 to hand motions (average, 20/80). Despite clear corneal grafts in 24 (92%) of the 26 eyes that underwent corneal transplantation, visual acuity of 20/40 or better was obtained in only nine eyes (26%). Based on the intractable inflammatory sequelae associated with anterior chamber closed-loop IOLs, we strongly urge discontinuation of their use.

Aged↗
PubMed1987

Retinal detachment after extracapsular cataract extraction with posterior chamber intraocular lens.

The authors reviewed 3065 consecutive cases of extracapsular cataract extraction with posterior chamber lens implant (ECCE-PC IOL) and found the incidence of retinal detachment to be 1.4% overall (44/3065) and 1.7% in a group of eyes followed for at least 1 year (40/2330). Retrospective analysis of the retinal detachment (RD) group (n = 44) showed the patients to be significantly younger than the overall group (n = 3065) (P less than 0.0001). Comparison with an age-matched group of 302 eyes without RD showed higher rates of RD in males (P = 0.0013) and in eyes with axial eye length (AEL) greater than 25 mm (P less than 0.0001). No significant correlation was found between RD and PC IOL manufacturer, phacoemulsification (PKE), or primary discission. Sixty-four percent of RDs occurred within 1 year of cataract operation. Only 10% occurred more than 2 years later. Visual results in eyes with ultimate anatomic success of RD repair (43 of 44 eyes, averaging 15 months follow-up) are substantially better than previously reported in series with other types of IOLs (96% greater than or equal to 20/40 if the macula was not involved, 75% greater than or equal to 20/40 if the macula was involved).

Age Factors↗
PubMed1987

A clinical comparison of two methods of glare testing.

We evaluated two methods of glare testing, the Miller-Nadler Glare Tester (M-NGT, Titmus Optical, Inc.) and the Brightness Acuity Tester (BAT, Mentor O & O, Inc.). Resulting Snellen visual acuities both for a control group of normal volunteers and for a study group with cataract or posterior capsule opacification were compared using the two glare testers. The decreases in Snellen visual acuities were comparable in the eyes with cataract. No glare disability was measured in the control group. There was greater glare disability using the BAT compared with the Miller-Nadler test when eyes with posterior capsule opacities were compared.

Humans↗