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Biomedical subjects

J Hartstein

Publications and source records attributed to J Hartstein.

16 recordsLinked to original sources
PubMed1987

Investigation of contrast sensitivity following radial keratotomy.

Radial keratotomy is a surgical procedure for the correction of myopia in which the cornea is flattened by partial-thickness radial incisions. While postoperative visual acuity is usually good, measurements of acuity are of only limited value and do not describe visual performance for a variety of spatial frequencies and contrasts. In the present study, the effect of radial keratotomy on the contrast-sensitivity function was examined. Six spatial frequencies were tested (0.5, 1.0, 3.0, 6.0, 11.4, and 22.8 cycles/degree) using the Nicolet CS 2000 with patients wearing corrective lenses. The results revealed that, at least for the conditions tested, radial keratotomy does not produce a statistically significant decline in contrast sensitivity.

Humans↗
PubMed1987

Radial keratotomy increases the effects of disability glare: initial results.

Attempts to correct myopia by surgical intervention (radial keratotomy) are increasing, and disability glare is emerging as a common subjective postsurgical complaint. To date, efforts to quantify this complaint have failed. By measuring increment thresholds in the presence of a point-glare source, we have been able to measure large glare effects (up to six times normal) at low background luminance levels.

Humans↗
PubMed1984

Experience with the Sauflon 70 (Lidofilcon A) soft contact lenses for extended wear in myopia.

Sixty-four myopic patients were studied who wear the Sauflon 70 (Lidofilcon A) lens on an extended wear basis. The study showed that this lens is safe and effective for extended wear. It is a durable lens and can be sterilized by heat as well as chemical means, but seems to develop calcium deposits at the same ratio as other extended-wear lenses used for the correction of myopia.

Adolescent↗
PubMed1979

Prolonged wearing contact lenses and preliminary results.

Extended wear contact lenses are sure to gain approval sometime during 1979. Four such lenses are briefly described, and the author's experience with one of them is discussed. The characteristics that differentiate these lenses from daily wear lenses are the high water content and the thinness.

Aphakia↗
PubMedDate not supplied

Disposable hydrogel contact lenses for extended wear.

Nine ophthalmologists and nine optometrists conducted a premarket study of the Acuvue disposable contact lens manufactured by Vistakon, Inc. Of the 812 patients offered the lens, 733 accepted it and were enrolled in the study. These patients were fitted with the lens and followed for a period of 8 months. Over 98% of these patients had 20/25 or better vision on initial fitting; and subjective ratings of lens comfort were very good. Only 3.7% (27 of 733) discontinued wearing their lenses during the study period. Thirty-four patients (5.6%) experienced a problem while wearing their contact lenses.

Adolescent↗