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Results for “Sunlight”

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At least 685 records · Page 38Linked to original sources
PubMed1999

[Retinal lesion due to excessive exposure to sunlight].

Retinal damage caused by direct exposure to the sun's rays is well recognized by the ophthalmic community. Although functional ability in solar retinopathy is usually regained within weeks, some suffer long-term visual impairment. Anatomic damage to the retina, even in those who regain full vision, is permanent. We describe 2 cases of solar retinopathy, 1 of which remained with permanent loss of vision. The role of medical education in preventing damage from solar retinal hazards is stressed.

Adult↗
PubMed2002

The physics of light and sunlight.

The physical properties of light, both natural and artificial, play a significant role in its interaction with humans. Although there is a yet-to-be-explained duality between light as waves and light as photons, we do understand many of the characteristics of light that affect living things. Here I review the general history of light and its properties, especially those that affect human health.

Humans↗
PubMed2003

Identification of phototransformation products of prednisone by sunlight: toxicity of the drug and its derivatives on aquatic organisms.

Solar simulator irradiation of an aqueous suspension of prednisone, a widely prescribed drug, produces seven photochemical derivatives. The compounds have been identified on the basis of their physical features. All the chemicals have been tested to evaluate their toxic effects on freshwater organisms from different trophic levels. The rotifer Brachionus calyciflorus and two crustaceans, the cladoceran Daphnia magna and the anostracan Thamnocephalus platyurus, were used to perform acute toxicity tests. Chronic toxicity tests have been performed on the alga Pseudokirchneriella subcapitata (formerly known as Selenastrum capricornutum) and the crustacean Ceriodaphnia dubia. The results showed low acute and chronic toxicity of prednisone. Some of the photoproducts had high toxic effects on C. dubia.

Animals↗