PMCCPMCCPMCC

Search tips
Search criteria 

Advanced

 
Logo of brjopthalBritish Journal of OphthalmologyCurrent TOCInstructions for authors
 
Br J Ophthalmol. Mar 1990; 74(3): 177–179.
PMCID: PMC1042043
Retinal laser lenses: magnification, spot size, and field of view.
M A Mainster, J L Crossman, P J Erickson, and G L Heacock
Department of Ophthalmology, Kansas University Medical Center, Kansas City.
Abstract
Proper use of ophthalmoscopic contact lenses for retinal photocoagulation requires knowledge of their comparative magnification, spot size, and field of view. We determined these parameters for four commonly used lenses, using data measured from optical components of the lenses and a commonly used photo-coagulator slit-lamp and spot size changer. A Krieger lens has 8% more working field of view and 29% less magnification than a Goldmann lens. A Panfundoscope lens has 84% more working field of view and 24% less magnification than a Goldmann lens. A Mainster lens has 58% more working field of view and 3% more magnification than a Goldmann lens. For Goldmann, Krieger, Panfundoscope, and Mainster lenses, respectively, retinal spot size is 8%, 53%, 41%, and 5% greater than photo-coagulator spot size settings. The field of view of each lens is increased in myopic and decreased in hyperopic patients. Anterior segment irradiance is higher than retinal irradiance for 1000 microns spot size settings with a Panfundoscope or Mainster lens, and this setting should be avoided, especially in patients with hazy ocular media.
Full text
Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (626K), or click on a page image below to browse page by page.
Articles from The British Journal of Ophthalmology are provided here courtesy of
BMJ Group