phakometer

0.01 sec.

phakometer

Optical instrument designed to measure the radii of curvature of the crystalline lens. The method is based on a comparison of the sizes of the third h′₃ and fourth h₄′ Purkinje images (typically determined by photography) with that of the first image h′₁, that is the anterior corneal surface, the characteristics of which are easily measured. The radius of curvature of, say the fourth Purkinje image r′₄ can be calculated using the approximate equation

r′₄ = r₁ (h₄′/h′₁)

where r₁ is the radius of curvature of the front surface of the cornea. If the test object is near the eye a correction factor is necessary. See Purkinje-Sanson image; ophthalmophakometer; phacoscope.

Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.

?Page tools

Printer friendly
Cite / link

Feedback
Add definition

Mentioned in	?		Medical browser	?		Full browser	?
biometry of the eye ophthalmophakometer phacoscope			phagocytic disorder phagocytic dysfunction disorders phagocytic index phagocytic pneumonocyte phagocytic vacuole phagocytin phagocytize phagocytoblast phagocytolysis phagocytose phagocytosis phagodynamometer phagokaryosis phagolysosome phagosome phagotype phak(o)- phak- phakic phakic eye phakitis phako- phakoma phakomatoses phakomatosis phakometer phal Phalacrocorax phalang(o)- phalangeal phalangeal cell phalangeal joint phalangectomy phalanger phalanges Phalangida phalangitis phalanx Phalaris phalaris staggers Phalen sign Phalen's maneuver Phalilalia phall- phallectomy phalli phallic phallic phase phallic stage phallic symbol phallitis			Phaiakes Phaiakia Phaiákia Phaiakian Phaiákian PHAII Phail Phail Phail Phail Phainopepia Phainopepla Phainopepla nitens Phaistos phaius PHAK phak(o)- phak- phakic phakic eye Phakic intraocular lens Phakic intraocular lens Phakic intraocular lenses Phakic intraocular lenses phakitis phako- phakoma Phakomatoses Phakomatoses phakomatosis phakometer Phakoscope phal phal phal phal phal Phal'aris Phal'aris Phal'aris Phalaborwa Phalaborwa, South Africa Phalacridae Phalacrocoracidae Phalacrocoracidae Phalacrocoracidae Phalacrocoracidae Phalacrocorax Phalacrocorax Phalacrocorax Phalacrocorax Phalacrocorax carbo phalacrosis Phalaena Phalaenid Phalaenidae Phalaenopsis Phalaenopsis amabilis Phalaenoptilus Phalaenoptilus nuttallii Phalang Dharma Party

Medical Dictionary

Free Tools:	For surfers: Free toolbar & extensions \| Word of the Day \| Help For webmasters: Free content \| Linking \| Lookup box \| Double-click lookup

Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.