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Results for “Eye Protective Devices”

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At least 883 records · Page 49Linked to original sources
PubMed1989

The effect of time, patching, and lens flexibility on RGP lens adherence.

The effects of time, eye patching, and lens flexibility on rigid lens adherence was evaluated in five overnight, in-laboratory test sessions. Patching was investigated with a group of 11 subjects in two overnight test sessions. Sleep time and lens flexibility were investigated in three separate overnight test sessions with two groups of subjects wearing two lens types of fluorosilicone materials (Dk 92 and 60). Adherence occurred in a significant portion of eyes within a 2-hour time period, and the incidence increased throughout the night. There was no significant difference between the incidence of adherence for lenses of a flexible material compared to lenses of a more rigid material (p greater than 0.6, X2 test), nor did patching have a significant influence on the incidence of adherence. The mechanism of lens adherence may be related to several factors including arbitrary lens movement to a peripheral corneal position, the creation of a geometric spacing between the lens and the eye, lid forces producing a negative pressure, and an increase in tear viscosity throughout the night.

Adhesiveness↗
PubMed1977

Protective corneal membranes in the treatment of eye disease.

A protective corneal membrane (PCM) is a specific hydrophilic bandage lens made from Sauflon 85% hydrophilic material, chosen for its high oxygen transmission. The back curve or radius is 8.40 mm, the overall diameter 15.50 mm, and the centre thickness 0.15 mm. The PCM is made afocal, so that it will not alter whatever vision is present in the eye. This is particularly important when it is used for long-term treatment.

Cornea↗
PubMedDate not supplied

Eye injuries in sports.

Of the 3,500 sports and recreational eye injuries reported in Canada over the past 15 years, 400 eyes remain legally blind. Most of the eye injuries could have been prevented. The activity causing most sports eye injuries varies from country to country. The sport causing most eye injuries in Canada is ice hockey. A study done in the 1970s by the Canadian Ophthalmological Society resulted in high stick rules and the wearing of certified face protectors by hockey players. The availability of certified eye protectors for racquet sports players has greatly reduced the incidence of eye injuries in racquetball and squash. Probably 90% of sports injuries can be prevented by modifying and enforcing game rules and by wearing certified eye protection.

Athletic Injuries↗
PubMed1989

Depth perception after prolonged usage of night vision goggles.

The present study was initiated following a report that a few helicopter pilots had failed a test of stereoscopic depth perception after a prolonged training flight employing night vision goggles (NVGs). In order to determine the cause of the loss, 12 helicopter pilots/copilots were assessed for depth perception, lateral and vertical phoria, and contrast sensitivity before and after training flights requiring the pilots to wear night vision goggles for the duration of the flight. Pilots flew one to three missions while wearing either PVS-5A or AN/AVS-6 goggles. Mission duration ranged from 1 to 4 h. The results indicate that contrast sensitivity and depth perception when monocular cues are present did not degrade over the course of the mission. Lateral phoria, however, did demonstrate an average exophoric shift of 1.5 prism diopters for 12 out of the 24 missions. The results indicate that the original report of a loss of depth perception based on a test of depth requiring stereopsis might have been caused by a shift in lateral phoria. It would be expected that as additional fusional effort is required, the minimum resolvable disparity degrades due to the increase in accommodation brought about through vergence accommodation. Possible causes for the phoria shift and future testing are discussed.

Accommodation, Ocular↗
PubMed1989

Eye injuries associated with 'war games'.

Eye injuries sustained by 4 patients who took part in 'war games' (in which young men shoot at each other with pistols powered by compressed carbon dioxide and firing latex rubber bullets filled with non-toxic paint) are described. In 3 cases the injuries were severe, including traumatic cataract, and 1 of these patients has a permanent macula scar with vision reduced to 6/36. Although eye protection is recommended, it was found that in the 'battle situation' combatants did not always follow regulations. Attention is drawn to the seriousness of disregarding the need for correct protective glasses.

Adolescent↗
PubMed1989

Affective responses to eyeglasses: evidence of a sex difference.

Subjects indicated their affective reactions to a male and female photographed with eyeglasses, dark sunglasses, or a facial scar. The models' scars evoked considerable negative affect, and their sunglasses evoked a neutral reaction. The female's eyeglasses evoked almost as much negative affect as her scar, suggesting that they were associated with an unattractive disfigurement or defect. The male's eyeglasses evoked more positive affect than their sunglasses. Supplemental reanalyses of earlier data confirmed that eyeglasses detract from ratings of females' attractiveness, but they improve ratings of males' attractiveness.

Attitude↗
PubMed1989

Compatibility of the aviation night vision imaging systems and the aging aviator.

With the advent of the night vision goggle (NVG) mission requirements in the United States Army, the reserve components began training with the second generation (AN/PVS-5 & AN/PVS-5A) systems. These systems prohibit the wear of spectacles by the aviator. Certain modifications on some systems allowed for spectacle wear. However, there still exists a 5-h day filter training minimum in which the full NVG with facemask and cushion must be worn without spectacles. The NVG system corrects up to +2.00 diopters of hyperopia and up to -6.00 diopters of myopia, but only +/- 1.00 diopter of astigmatism. A survey of the reserve component (USAR and NG) aviators in the Southwest was conducted to establish the relative incompatibility of the NVG system among an aviator population older than the active component aviators. All medical record custodians received questionnaires and the flight surgeon followed up replies by telephone or on-site visits. We screened a total of 127 aviator records. The aviator's average age was 39.5 years; 65.3% had 20/20 vision and were emmetropes. Of those that wore spectacles, 82.4% had hyperopia or myopia correctable by the built-in optical adjustments contained in the NVG. The other 17.6%, who had vision that exceeded the correction factors built into the NVG, consisted of astigmats with greater than 2.00 diopters of cylinder. Nearly 20% of the aviators who wore corrective lenses exceeded the corrective limits of the goggles that they used. Further, pilots had no specific prescreening instruction. With the development of more sophisticated aviation optics. Three options exist: modify visual standards, allow contact lens wear, or design future systems to be compatible with spectacles.

Adult↗
PubMed1979

The eyes have it.

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Dentists↗