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| Author | Subject: Slit Lamp |
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 nerius
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Slit Lamp
Mar 07, 2005 20:28:54 1) Why is an angle of 60 used for Van Herrick's?
2) Why can you only view specular reflection monocularly? |
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mrdougan
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RE: Slit Lamp
Mar 07, 2005 21:50:27 1) Angle of 60 is where the light hits the plane of incidence (90degrees to tangent) at the most outer region of the cornea (right before the limbal margin)
2) The angles of incidence and reflectance need to be equal, to enable you to align the purkinje image onto the endothelial surface when viewing an optic section. Hence it is only visible through one eye piece.
Other comments are welcome. |