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ophthalmoscope |
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ophthalmoscope (ŏfthăl`məskōp'), instrument used for examining the inner structure of the eye eye, organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many
..... Click the link for more information. . The device was invented by the German physiologist H. L. F. von Helmholtz in 1851. His model consisted of three plates of glass pressed together and mounted on a handle at a 45° angle. A light was placed beside the subject whose eyes were to be examined. Some light passed through the plates, but some was reflected back into the eye. The form of the instrument now in general use consists of a concave mirror and a battery-powered light source within a tubular handle. Sighting is through a single or binocular eyepiece. The ophthalmoscope is equipped with a rotating disc of lenses to permit observation of the eye at varying depths and magnifications. Examination of the eye may be enhanced by administering drugs to dilate the pupil. ophthalmoscope an instrument for examining the interior of the eye ophthalmoscope [äf′thal·mə‚skōp] (optics) An instrument, consisting essentially of a concave mirror with a hole in it and fitted with lenses of different powers, for examining the interior of the eye through the pupil. 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. |
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No references found | CAPTION(S): GLEN THRILLER Johnson thrived on the attack - but was less than certain when called upon to defend SLO MOTION Joleon Lescott fails to stop Slovenia's goal As the other services fill their SLO positions and that information becomes available, we will include it in next year's listing. However, microperimeters are not widely available; the Rodenstock SLO is no longer being manufactured, and the MP-1 costs about $48,000, so that most low vision providers do not have access to them. |
SLO |
SLNA SLNB SLNC SLNCE SLNCI SLNCV SLND SLNE SLNHA SLNHANJ SLNIE SLNL SLNM SLNN SLNP SLNPV SLNRA SLNRC SLNS SLNSC SLNSW SLNT SLNTG SLNZ SLO Slo-BidSlo-Bid Slo-Bid Slo-Indo Slo-Indo Slo-Mag Slo-Mag slo-mo Slo-phyllin Slo-phyllin Slo-phyllin slo-pitch Slo-Pro Slo-Salt Slo-Salt Slo-Salt SLOA SLOAC sloakan sloam Sloan Sloan Sloan Christian Fellowship Sloan Digital Sky Survey Sloan Extension for Galactic Understanding and Exploration Sloan foundation Sloan Foundation Forest Industries Center Sloan Intelligence Test-Revised Sloan Jr., Alfred Sloan Jr., Alfred P. | |||||||
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