Relative blue-light extinction in lens nucleus related to age and cataract

David L. Krohn, Penny Asbell, Karen Ullian, Steven Katz

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The extent of visual function loss from nuclear cataractous change can be estimated by observing the extinction of blue light compared to white light as a function of saggital lens depth in standard slit lamps. Apparent extinction (loss of transmissivity) of 50% or more of the depth of the lens in blue light of maximal intensity compared to white light at minimal intensity is associated with marked visual loss. However, this transmissivity ratio of 0.5 or less also applies if light intensity remains constant and the blue filter is simply moved in and out of the light beam. Therefore, if 50% or more of the lens appears dark to blue-filtered light, nuclear changes have significantly decreased effective visual acuity. Relative blue-light extinction associated with nuclear change that may be amenable to surgical correction can thus be distinguished from the extinction effect caused by age alone.

Original languageEnglish (US)
Pages (from-to)598-602
Number of pages5
JournalAmerican Journal of Ophthalmology
Volume91
Issue number5
DOIs
StatePublished - Jan 1 1981
Externally publishedYes

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Cataract
Lenses
Light
Psychological Extinction
Visual Acuity

All Science Journal Classification (ASJC) codes

  • Ophthalmology

Cite this

Relative blue-light extinction in lens nucleus related to age and cataract. / Krohn, David L.; Asbell, Penny; Ullian, Karen; Katz, Steven.

In: American Journal of Ophthalmology, Vol. 91, No. 5, 01.01.1981, p. 598-602.

Research output: Contribution to journalArticle

Krohn, David L. ; Asbell, Penny ; Ullian, Karen ; Katz, Steven. / Relative blue-light extinction in lens nucleus related to age and cataract. In: American Journal of Ophthalmology. 1981 ; Vol. 91, No. 5. pp. 598-602.
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