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Biomedical subjects

B Kislin

Publications and source records attributed to B Kislin.

12 recordsLinked to original sources
PubMed1976

The effect of aging on the impact resistance of heat tempered lenses.

Stock sperocylindrical lenses (125) with approximately 2.2-mm center thickness were bevel-edged to 48-mm size in the S-10 standard military lens shape. One time each, 25 lenses were drop balled directly after heat treatment; 25 after 3 months;25 after 6 months; 25 after 9 months; and the final 25 after 1 year. Comparing these samples against each other showed no statistical difference in breakage. All the surviving lenses were then drop balled repeatedly until broken or 25 impacts had been made. After 25 hits, 76.8% of the lenses did not break. There was no statistical difference in breakage when these results were compared with 125 heat-treated lenses of similar specifications that were drop balled for 25 trials, if not broken sooner, just after routine heat-treatment processing. Lenses of approximately 3.0-mm center thickness, with other aspects the same, were also treated. The effect of drop balling nonheat-tempered lenses of dimensions similar to the aged lenses was studied; the first drop had a casualty rate of 75%, and no lens survived more than 8 impacts.

Eyeglasses↗
PubMed1975

Visual performance through a sample windshield segment of the B-1 aircraft.

The stereopsis performance of 16 subjects was measured on an automated Howard-Dolman apparatus and compared with their performance through a sample segment of a proposed B-1 aircraft windshield. Recognition visual acuity was determined for 15 subjects using a low-contrast Landolt C target viewed with and without the segment. When the task was performed through the windshield segment, a statistically significant loss in stereopsis resulted, but no significant loss in visual acuity.

Aircraft↗
PubMed1975

Effects of hyperbaric air pressure on keratometry.

Following reports of vision blur by scuba divers at depth below 100 feet, keratometric readings were taken on volunteers inside a hyperbaric chamber at the USAF School of Aerospace Medicine. It was found that as the pressure within the chamber increased, the corneal reading showed an increased dioptric value. This change in refractive condition also occurred in measurement on test steel balls. Whether this dynamic response was due to increased atmospheric index, or displacement of instrument optics, was explored.

Air Pressure↗