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L Poirier

Publications and source records attributed to L Poirier.

77 records · Page 5Linked to original sources
PubMedDate not supplied

An evaluation of an air-supplied blouse and an air hood.

Fit factor studies for an air-supplied blouse (blouse) and an air hood respirator (air hood) were conducted by Lawrence Livermore National Laboratory. Nine test subjects were used to test the blouse. Three subjects were used to test the air hood. Exercises conducted in the test chamber included touching toes, raising both arms overhead, squatting, twisting at the torso while holding a rod, and running in place. Both the air hood and blouse were tested with 8 ft3/min air supply. Both respirators were worn in a test chamber. The blouse provided a fit factor of greater than 40,000. The air hood, for nearly all tests, also provided a fit factor greater than 40,000 when worn correctly. Fit factors were also measured for improperly worn air hoods.

Evaluation Studies as Topic↗
PubMedDate not supplied

Energy fluctuations in an excimer laser during photorefractive keratectomy.

We performed an experiment with the MEL 60 excimer laser (Aesculap Meditec Technology) to demonstrate the variations of energy of the laser beam that could happen during a refractive surgical procedure. In order to quantify such variations, we measured the whitening of a photographic paper after a series of exposures to the laser beam with the X rite 400 B/W reflection densitometer. The energy fluctuations noted between two series of pulses averaged 11.02% (minimum 0; maximum 46). These fluctuations tended to decrease progressively during the procedure. The energy of the laser beam decreased with time. At the end of the experiment, the total loss of energy was 45.16%. These results suggest that clinically meaningful energy variations could happen during the photorefractive keratectomy and reduce refractive predictability.

Cornea↗
PubMedDate not supplied

Effect of peripheral deepening of radial keratotomy incisions.

BACKGROUND: Single and double deepening of the peripheral part of radial keratotomy incisions are used to increase the refractive effect. METHODS: Single peripheral deepening was performed in 52 eyes of 36 patients and double peripheral deepening in 19 eyes of 14 patients who received radial keratotomy. RESULTS: In the single peripheral deepening group, the mean change in refractive power was 4.01 diopters (D); 53.8% of eyes were within +/- 1.00 D of emmetropia; residual myopia was greater than -1.00 D in 46.2% of eyes; 65.4% of eyes achieved an uncorrected visual acuity greater than or equal to 20/40. In the double peripheral deepening group, the mean change in refractive power was 5.07 D; 52.6% of eyes wee within +/- 1.00 D of emmetropia; residual myopia was greater than -1.00 D in 47.4% of eyes; 89.4% of eyes achieved an uncorrected visual acuity greater than 20/40. The difference in mean dioptric change between the standard radial keratotomy groups and the single and double peripheral deepening groups was 0.53 D and 0.47 D, respectively. CONCLUSIONS: Considering the limited additional dioptric change compared with the standard radial keratotomy surgical technique and the increased rate of complications, we think that peripheral deepening in radial keratotomy should be avoided.

Adult↗