By American Academy of Ophthalmology, Debra J. Shetlar, MD
Discusses advances within the prognosis and class of tumors because it publications the reader via a logical, tissue-specific series that levels from topography via illness procedure to common and differential prognosis. contains many new colour pathologic and scientific pictures and diagrams. Covers wound fix; specimen dealing with, together with processing and marking; and diagnostic suggestions. additionally contains a list for asking for ophthalmic pathologic session.
Read or Download 2007-2008 Basic and Clinical Science Course Section 4: Ophthalmic Pathology and Intraocular Tumors PDF
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Additional resources for 2007-2008 Basic and Clinical Science Course Section 4: Ophthalmic Pathology and Intraocular Tumors
25 3. Finally, identify the axis: VL1 = Bx + Dy y= 2. 295 DH-BV x = AD- 62 AD - B2 = [(S + C cos' 8)(S + C sin? 8)]- (C sin 8 cos W sin? 8 + SC cos' 8 + (C sin 8 cos 8)2 (C sin 8 cos 8)2 = S2 + SC Since sin? 8 + cos! 7 mm out AD - B2 = S(5 + C) DH-BV x = 5(5 + C) Note it is a right eye, so the axis is (180standard notation). 08 Note that if (5(5 + C) equates to zero, then there is no possible solution. There are some special cases where solutions are possible, such as when the cylinder axis is 900 or 1800 When prisms are placed in front of one eye, the effects of combining prisms are simply additive.
The sphere and cylinder of a sphero-cylindrical prescription can be trea ted as two separate lenses . 00 DC X 180 lens is dec entred 3 mm up in front of an eye ? 9L\ Base Up, as in the previous example. 00 DC x 90, vertical de centration along the cyl axis wou ld have given no prismatic effect as there is no power in th is meridian . 7. Decentration of a plano-cylinder. This is a negat ive cylinder, axis 90. If the lens is moved verti cally along the axis there is no power and therefor e no prismatic effect.
The reductions in function are mainly due to chromatic aberration, and are more pronounced for Fresnel prisms than for conventional prisms. Prismatic effects of focal lenses In Chapter 1 it was shown that even if a focal lens has no prism worked onto it, the lens has prismatic effects when viewed through points on the lens away from the optical centre . 12 If the optical centre of a lens is moved away from a given reference point, such as the patient's visual axis, the lens is said to be decentred.