Absorption of 308-nm excimer laser radiation by balanced salt solution, sodium hyaluronate, and human cadaver eyes
- Univ. of California, Irvine (USA)
Absorption of the excimer laser radiations of 193-nm argon fluorine and 308-nm xenon chloride in balanced salt solution, sodium hyaluronate, and human cadaver eyes was measured. The absorption of these materials as considerably different for the two wavelengths; we found that 308-nm light experienced much less absorption than the 193-nm light. The extinction coefficient (k) for 308 nm was k = 0.19/cm for balanced salt solution and k = 0.22/cm for sodium hyaluronate. In contrast to this, the extinction coefficient for 193 nm was k = 140/cm for balanced salt solution and k = 540/cm for sodium hyaluronate. Two 1-day-old human phakic cadaver eyes showed complete absorption with both wavelengths. Using aphakic eyes, incomplete absorption was noted at the posterior pole with 308 nm and complete absorption was noted with 193 nm. The extinction in the anterior part of aphakic eyes (the first 6 mm) was 4.2/cm for 308 nm, meaning that the intensity of the light is reduced by a factor of 10 after traveling the first 5.5 mm. However, we observed that the material in the eye fluoresces, meaning the 308 nm is transformed into other (longer) wavelengths that travel through the total eye with minimal absorption. Conclusions drawn from this experiment are that the use of the 308-nm wavelength may have undesirable side effects, while the use of the 193-nm wavelength should be consistent with ophthalmic use on both the cornea and the lens.
- OSTI ID:
- 6274778
- Journal Information:
- Archives of Ophthalmology (Chicago); (USA), Journal Name: Archives of Ophthalmology (Chicago); (USA) Vol. 108:11; ISSN 0003-9950; ISSN AROPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
62 RADIOLOGY AND NUCLEAR MEDICINE
ABSORPTION
ACETATES
AMINES
BIOLOGICAL EFFECTS
BODY
BODY AREAS
CARBOHYDRATES
CARBOXYLIC ACID SALTS
ELECTROMAGNETIC RADIATION
EYES
FACE
HEAD
HYALURONIC ACID
LASER RADIATION
MEDICINE
MUCOPOLYSACCHARIDES
OPHTHALMOLOGY
ORGANIC COMPOUNDS
ORGANS
POLYSACCHARIDES
RADIATIONS
SACCHARIDES
SENSE ORGANS
SENSITIVITY
WAVELENGTHS