Minimal spot size on the retina formed by the optical system of the eye

✍ Scribed by R. Birngruber; E. Drechsel; F. Hillenkamp; V. -P. Gabel

• Publisher: Springer Netherlands
• Year: 1979
• Tongue: English
• Weight: 699 KB
• Volume: 1
• Category: Article
• ISSN: 0165-5701
• DOI: 10.1007/bf00137496

✦ Synopsis

A knowledge of the quality or the ocular optical system is of primary importance in light-and laser-photocoagulation of the fundus. A study was therefore undertaken to determine the minimal spot size of a Helium-Neon laser focused on the retina of rabbits: freshly enucleated eyes were carefully mounted in a specially designed eye holder. A small hole was then trepanized throug the sclera and neural retina in the macular region. A minimal spot was produced on the retina and the spot size was measured by scanning the intensity aistribution of an enlarged image. It was shown that a diffraction limited spot size can be obtained under certain circumstances. The light scattering out of the focus, however, is about fifty percent.