🛠️ Invention or technique

Finsen's phototherapy

Fototerapia de Finsen

Date
1893-1896 · confidence high
Place
Finsen Institute, Copenhagen, Denmark
Credited to
Niels Ryberg Finsen
Field
Life & health

What it is

Finsen showed that ultraviolet light concentrated with lenses cures lupus vulgaris, a skin tuberculosis, and in 1896 opened the Medical Light Institute in Copenhagen. It was the first effective treatment of lupus vulgaris.

Its efficacy was due partly to ultraviolet light and partly to heat; success occurred in localised lupus vulgaris cases, not internal tuberculosis. It was superseded by antibiotics in the 1940s.

What it led to

  • the 1903 Nobel Prize in Medicine
  • ultraviolet phototherapy for psoriasis and other skin diseases
  • blue-light phototherapy for neonatal jaundice (1950s-1960s)

Links

Sources✓ verified 2026-11-04