By James J. Reidy MD
Discusses the constitution and serve as of the cornea and exterior eye and experiences proper exam recommendations. Covers infectious and ocular floor illnesses, problems and surgical procedure of the ocular floor, immune-mediated and neoplastic issues, congenital anomalies and degenerations. A lately up to date bankruptcy at the genetics of corneal dystrophies displays the recent IC3D class. Discusses poisonous and hectic accidents and corneal transplantation. comprises many new colour pictures. lately revised 2010 2011.
Read or Download 2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course) PDF
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Additional resources for 2011-2012 Basic and Clinical Science Course, Section 8: External Disease and Cornea (Basic & Clinical Science Course)
The peripheral zone is also kn own as th e transitional zon e, as it is the area of greatest flatten ing and asphericity of the no rmal corn ea. The limbus is adjacent to the sclera and is the area where the cornea steepens prior to join ing the sclera at the limbal sulcus. 4 m m because of the Stiles-Crawford effect. The corneal apex is the point of maximu m curvature, typically temporal to the center of the pupil. The corneal vertex is the point located at the intersection of the patient's line of fixation and the corneal surface.
The normal endothelial cell density dec reases with age. Endothelial cell density normally exceeds 3500 cells/m m' in childre n and graduall y declines with age to about 2000 cells/mm' in older people. An average value for adults is 2400 cells/mm' (1500-3500) , with a mean cell size of 150- 350 fUll '- Corneas with low cell densit y (eg, fewer than 1000 celis/nUll') might not tolerate intraocular surgery. Coefficient of va riation. 30. Polymegathism is increased va riation in individual cell areas; it typically in creases with contact lens wear.
3375 is used in calculating central corneal power. 5-mm radius of cu rvature. Average refractive power of the central cornea is about +43 D, which is the sum of the refract ive power at the air-stroma interface of +49 D minus the endothelium-aqueous power of 6 D. 376. 06 D. BCSC Section 3, ClinicaL Optics, covers these topi cs in greater depth. 0-mm zo ne. These points do not represent the corn ea l apex or vertex but are a clinicall y useful estimat ion of centra l corneal power. The radius of curvatu re is calculated fro m the simple vergence formula using the known circular object size and measuring the distance with doubling prisms to stabilize the image.