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Biomedical subjects

L E Katzen

Publications and source records attributed to L E Katzen.

8 recordsLinked to original sources
PubMed1994

Stop and chop phacoemulsification.

We present a method for phacoemulsification within the capsular bag in which sculpting is performed to provide space for nuclear manipulation and then the posterior plate is cracked into two halves. The nuclear rim is chopped into bite-size pieces for removal using a modified lens hook that is buried in the nuclear periphery and pulled toward the center. The procedure begins as a routine nuclear cracking technique and then stops. It continues as a chop technique.

Cataract Extraction↗
PubMed1983

YAG laser treatment of cystoid macular edema.

Fourteen eyes (some aphakic and some with implanted intraocular lenses) underwent neodymium-YAG laser treatment for cystoid macular edema with vitreous incarceration in the corneoscleral wound. Visual acuity improved in all 14 eyes; ten eyes improved at least three Snellen lines and 12 eyes improved at least two Snellen lines. After follow-up periods of one to nine months, 11 eyes had visual acuities of 20/40 or better (only two had had visual acuities of 20/40 preoperatively and none had had a better visual acuity). An additional eye, which had an intraocular lens implant, was treated prophylactically. Visual acuity in this eye remained stable during a nine-month follow-up period. YAG laser treatment produced no adverse side effects or complications in any of the 15 eyes.

Aged↗
PubMed1983

The YAG laser: an American experience.

We used the OPL3 neodymium-YAG laser to treat 86 patients, 41 male and 45 female, for secondary opacification of an intact posterior capsule one month to four years after planned extracapsular cataract extraction or phacoemulsification, with or without intraocular lens implantation. Visual acuities improved as a function of corneal and macular competence, and careful post-procedure examination revealed no deleterious corneal, iris, vitreal or retinal side effects of the laser treatments. In some of the treated eyes, the implants had single or multiple, small (0.5 mm) white spots on their posterior aspects, or thin linear defects centrally, but in no case was this visually evident to the patient.

Adolescent↗
PubMed1983

Ongoing prospective clinical study of radial keratotomy.

The ongoing prospective clinical study of radial keratotomy at the University of Maryland now includes 58 eyes of 33 patients. Fifty-two eyes underwent a single operation, whereas six eyes underwent two operations. Follow-up was a minimum of six months and a mean of 19 months. Preoperative vision was 20/400 or less in 74% of eyes. Postoperative vision was 20/40 or better in 48% of eyes. There was an average myopia decrease of 2.70 diopters and an average corneal flattening of 1.51 diopters. Patients with preoperative refractive errors of 5 diopters or less achieved 20/40 or better vision in 65% of eyes, as compared to only 19% in eyes with preoperative refractive errors greater than 5 diopters. This is highly significant (P less than 0.005). There was no difference in the results achieved by our first 33 eyes when compared to our second 25 eyes. The decrease in myopia did not correlate with corneal curvature, or whether 8 or 16 incisions had been used. No microperforations were seen and only one case of endothelial cell loss was observed. Glare and fluctuating vision was not a significant problem in our series.

Adolescent↗
PubMed1982

Prospective clinical study of radial keratotomy.

A prospective clinical study of radial keratotomy was conducted at the University of Maryland. Results of surgery on 33 eyes of 19 patients with a minimum follow-up of seven months and a mean of 13.8 months are reported. There were eight patients (15 eyes) who needed adequate unaided visual acuity for occupational purposes. Preoperative visual acuity was 20/400 in 79% of eyes. Postoperative visual acuity was 20/50 or better in 48% of cases. However, in patients with preoperative refractive errors of 5 diopters or less, postoperative visual acuity was 20/50 or better in 84% of cases. Average decrease in myopia was 2.5 diopters. Decrease in myopia following radial keratotomy did not correlate with corneal curvature or whether 8 or 16 incision technique was used. However, there was a very significant (P = 0.001) difference in postoperative visual acuity of patients with refractive error of 5 diopters or less, as compared to those with greater than 5 diopters of myopia. Complications included corneal scarring, vascularization, and glare. No microperforation or endothelial cell loss was observed.

Adolescent↗
PubMed1974

Chalazion removal.

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Anesthesia, Local↗