Accession Number:

ADA171385

Title:

Biological Applications and Effects of Optical Masers.

Descriptive Note:

Annual rept. 15 Mar 83-15 Mar 84,

Corporate Author:

VIRGINIA COMMONWEALTH UNIV RICHMOND

Personal Author(s):

• Ham,William T. , Jr

Report Date:

1984-06-01

Pagination or Media Count:

22.0

Abstract:

Additional data on 40 microsec pulses at a PRF of 400 Hz are presented. A log log plot is given of threshold corneal power Pa vs exposure time in s for PRFs of 100, 200 and 400 Hz. Pa decreases with PRF for shorter exposure times but seems to converge for exposures greater than 1000 s. A Workshop dealing with the possible long term ocular effects of optical radiation on aging and macular degeneration is discussed and an assessment of light effects on the retinal pigment epithelium RPE is appended to this report. A preliminary experiment on the additivity and reparation of repetitive exposures of light to the same retinal site is described. Repetitive 100 s exposures of blue light 440 nm or - 5 nm at 24 hour intervals were found to be additive for 2 exposures at 50 of threshold, for 3 exposures at 40 threshold, and for 4 exposures at 30 of threshold. Wavelengths at 490 and 520 nm were not additive even at 50 of threshold.

Descriptors:

• *EYE
• *LASER DAMAGE
• LIGHT PULSES
• RETINA
• EXPOSURE(PHYSIOLOGY)
• BLUE(COLOR)
• ARGON LASERS
• LASER MODULATORS
• ACOUSTOOPTICS

Subject Categories:

• Radiobiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE