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Biomedical subjects

C D Fritch

Publications and source records attributed to C D Fritch.

11 recordsLinked to original sources
PubMed1998

Risk of retinal detachment in myopic eyes after intraocular lens implantation: a 7 year study.

PURPOSE: To evaluate the benefits and risks of lens removal using extracapsular cataract extraction (ECCE), primarily phacoemulsification, to correct high myopia. SETTING: A Medicare accredited surgical center, Bakersfield, California, USA. METHODS: Five hundred eighty-one lens extractions were performed in 311 patients from 1989 to 1996. Surgeries were performed by the same surgeon (C.D.F.). The incidence of capsule rupture, vitreous loss, and retinal detachment, as well as preoperative and postoperative visual acuities, were studied. RESULTS: Phacoemulsification was performed in 73.4% of cases, planned ECCE in 24.8%, and unplanned ECCE in 1.8%. Capsule rupture occurred in 1.5% and vitreous loss in 0.8% of cases. Two cases of retinal detachment occurred 1 to 2 years postoperatively. In 76.2% of patients, uncorrected visual acuity was 20/40 or better. CONCLUSION: Carefully selected patients with high myopia may benefit from cataract extraction and posterior chamber intraocular lens placement. This study suggests an acceptable level of safety.

Adult↗
PubMed1992

A prospective, randomized, double-masked comparison of a zonal-progressive multifocal intraocular lens and a monofocal intraocular lens.

INTRODUCTION: Multifocal intraocular lenses (IOLs) have been designed to provide improved near visual acuity without spectacles compared with monofocal IOLs. Early studies have reported variables amounts of decreased visual acuity and contrast sensitivity with multifocal IOLs, and some patients have experienced halos and glare. METHODS: The authors performed a prospective, double-masked, multicenter evaluation of 62 patients randomized between a new zonal-progressive optic multifocal IOL and a monofocal IOL. RESULTS: Mean postoperative spherical equivalent, astigmatism, and uncorrected and best-corrected distance visual acuity were similar between the two groups. Patients with a multifocal IOL achieved significantly better uncorrected near visual acuity than patients with monofocal IOLs (J3+ versus J7; P less than 0.0001). With distance correction only, mean near visual acuity was J2 versus J5- (P = 0.0001). Best-corrected near visual acuity was J1 for both groups, with 1.36 diopters (D) for the multifocal group versus 2.37 D for the monofocal group (P less than 0.0001). Regan contrast sensitivity was lower for the multifocal patients at all contrast levels, and achieved statistical significance at very low contrast (11% contrast; P = 0.0024). Fifty-two percent of patients with a multifocal IOL reported that they did not need spectacles at all or used them only for their fellow eye, compared with 25% of the patients with monofocal IOLs. CONCLUSION: Both monofocal and multifocal implant patients were very satisfied with the results of their cataract extraction and IOL implant surgery. A small loss of contrast sensitivity with the multifocal IOL was demonstrated, consistent with theoretical predictions. The functional significance of the loss of contrast sensitivity appears to be small and counterbalanced by the advantage of improved uncorrected near visual acuity.

Aged↗
PubMed1980

Clinical evaluation of intraocular lens calculations.

The DBR-300 A-Scan ultrasonic unit was used to evaluate 100 patients preoperatively. Intraocular lens power was calculated using the formula supplied with the instrument and the accuracy of the instrument was then evaluated. It was determined that 54% of our patients were within +/- 1.00 diopter of the calculated refractive error and that 85% of the patients were within +/- 2.00 diopters and that 97% were within +/- 3.00 diopters. Only 3% of our patients had greater than a 3.00-diopter difference between predicted and actual postoperative refractive error. A standard 3.2-mm anterior chamber depth was utilized for Choyce lenses and 3.4 mm ACD was utilized for Medallion lenses. No single factor could be found to account for the slight tendency toward myopia, although several were found to contribute. No single factor was found to contribute to large errors, though the 3% of patients with greater than three diopters variation from the predicted refractive error demonstrated high degrees of cylinder or corneal astigmatism postoperatively as compared to preoperatively. Though we are presently in the process of reviewing ACD postoperatively, one would not suggest any drastic changes in the values at this time due to the overall accuracy obtained. Certainly though small adjustments may be made in the Binkhorst formula in the future, this is yet to be proven clinically.

Humans↗
PubMed1978

Phacoemulsification and retinal detachment.

Retinal detachment is not eliminated nor decreased to a rare complication after phacoemulsification. There were 94 eyes examined with retinal detachments after phacoemulsification and the majority were operated upon. The fundus view might be hampered and some areas of the retina obscured by this form of lens extraction. There are, however, some cases where the small incision and relative clarity of the media, soon after cataract surgery, offer an advantage.

Adolescent↗
PubMed1977

Phacoemulsification and retinal detachment.

Retinal detachment is not eliminated nor decreased to a rare complication after PE. There were 94 eyes with retinal detachments after PE examined and the majority operated. The fundus view might be hampered and some areas of the retina obscured by this form of lens extraction. There are, however, some cases where the small incision and relative clarity of the media, soon after cataract surgery, offer an advantage.

Adolescent↗
PubMed1976

Traumatic hyphema.

This report contains a study in retrospect of 50 patients treated for traumatic hyphema between 1964 and 1974 at the Kern Medical Center, Bakersfield, California. The prognosis for visual acuity is summarized in 3 distinct groups. The 50 patients studied were all treated in a similar manner by conservative method of bed rest with elevation of the head from 20 to 30 degrees and binocular patching. A review of our statistics, we believe, warrants this conservative method of treatment.

Eye Injuries↗