By American Academy of Ophthalmology, Carl D. Regillo, MD
Presents present info from medical trials on significant retinal stipulations, together with age-related macular degeneration and diabetic retinopathy. contains an summary of diagnostic thoughts in retinal imaging, electrophysiologic checking out, and new genetic techniques to diagnosing and classifiying retinal dystrophies and degenerations.
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Extra resources for 2007-2008 Basic and Clinical Science Course Section 12: Retina and Vitreous
What is the far point of an eye? The term far point is used only for the optical system of an eye. It is the point at which an object must be placed along the optical axis for the light rays to be focused on the retina when the eye is not accommodating. 5. Where is the far point for a myopic eye? A hyperopic eye? An emmetropic eye? The far point for a myopic eye is between the cornea and infinity. A hyperopic eye has its far point beyond infinity or behind the eye. An emmetropic eye has light rays focused on the retina when the object is at infinity.
78. What is the threshold for prescribing glasses in a child with astigmatism? When visual acuity is not developing properly, as noted by amblyopia or strabismus. Give the full correction. Children tolerate full correction better than adults. 50 D of astigmatism. 00 D or more of hyperopic asymmetry also requires full correction. 30 OPTICS AND REFRACTION 79. What may cause monocular diplopia? & Corneal or lenticular irregularity & Decentered contact lens & Inappropriate placement of reading add & Transient sensory adaptations after strabismus surgery & Distortion from retinal lesions (rare) 80.
24. What is Prentice’s rule? D ¼ hD The prismatic power of a lens (D) at any point on the lens is equal to the distance of that point from the optical axis in centimeters (h) multiplied by the power of the lens in diopters (D). It follows that a lens has no prismatic effect at its optical center; a light ray will pass through the center undeviated (Fig. 3-7). 25. How is Prentice’s rule used in real life? In a patient who has anisometropia, the reading position may cause hyperdeviation of one eye due to the prismatic effect.