Relative Sensitivity of Various Areas of the Retina to Laser Radiation

Lappin, Paul W.; Coogan, Philip S.

doi:10.1001/archopht.1970.00990040352015

Cited by 29 publications

(17 citation statements)

References 1 publication

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“…The predictions are shown along with measurements previously reported by Lappin and Coogan [4] that were obtained with a He-Ne laser with 40 msec exposures in rhesus monkeys using five-minute post-exposure criteria. The measurements demonstrate the relatively uniform response of the retina to laser injury, while showing a modest increase in threshold injury observed on the nasal side of the macula.…”

Section: Resultsmentioning

confidence: 57%

“…In any case the actual sensitivity of the peripheral retina must be determined in order to allow these judgments. Lappin and Coogan [4] examined the relationship between peripheral and central retinal sensitivity to laser irradiation (Helium Neon, 632 nanometers, 40 millisecond pulses) and found the macula to be most sensitive to injury, and the area near the optic disc to be least sensitive. They attributed the sensitivity to variation in image quality at the retina, Nerve Fiber Layer (NFL) thickness, and density of pigment granules in the macular pigment epithelial cells.…”

Section: Introductionmentioning

confidence: 99%

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<title>Modeling of laser-induced threshold damage in the peripheral retina</title>

et al. 2002

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Though allowable (safe) energy doses of pulsed laser radiation have been determined in the central retina, the sensitivity of the peripheral retina to damage must also be assessed. We used results from ray-tracing in an eye model to estimate laser spot size at the retina and recent thermal model computations of damage thresholds to predict off-axis retinal injury from laser irradiation. The predictions were made for threshold exposures with a 532 nm, 10 ns, Nd:YAG laser beam that filled the dilated pupil (7 mm diameter). Results were compared to previously published measured energy doses at the cornea needed to produce a minimally visible lesion (MVL) in the peripheral retina of rhesus subjects. We predicted the threshold for injury at the macula, and at selected portions of peripheral retina out to 60 o from the fovea. Both predictions and measured data were normalized to their respective macula values. Normalized predicted thresholds in the peripheral retina increased as a function of angular distance from the macula. This varied from the measured data which, on the other hand, were relatively insensitive to angular position in the peripheral retina. The difference is likely due to improvements in methods of assessing retinal injury that have been incorporated into the model.

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Section: Resultsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

<title>Modeling of laser-induced threshold damage in the peripheral retina</title>

et al. 2002

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“…1970Ham et ah. , 1974Lappin and Coogan, 1970;Zweng et ah, 1970;Marshall et ah, 1974] have been performed which add to the collection of the lengthy literature on this area. In spite of all these studies, information on this particular area is far from being complete.…”

Section: Introductionmentioning

confidence: 99%

Changes in laser-irradiated retina in the first 24 h after irradiation

Yew¹,

Wong²,

Chan³

1979

Cells Tissues Organs

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“…Numerous reports have been centred around the applications and effects in the area of ophthalmology in the past decade [FlocksandZweng, 1964;Kuwabara and Aiello, 1969;Lappin and Coogan, 1970;Zweng et al. 1970: Ham el at.. 1974Marshall el at.. 1974], Structural damages and deviations, in particular of the retina, have been carefully evaluated and a tre mendous amount of information has been gathered.…”

Section: Introductionmentioning

confidence: 99%