眼科学常见英文概念PPT精品课程课件讲义

temperal sector defect, at the final stage there
maybe temperal island, or central island.
Байду номын сангаас
General Concepts
G. The etiology of glaucoma
Uncertain, except secondary ones.
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raised intraocular pressure.
• Most types of glaucoma are closely related with
increase in IOP.
• A group of person have a relatively higher IOP
without optic nerve damage.
General Concepts
H. The pathogenesis of glaucoma 1. The indirect ischemic theory postulates that raised
IOP causes death of nerve fibers by interfering with the
• A few glaucomatous patients have an progressive glaucomatous damage, even though the IOP is controlled
General Concepts
B. Intraocular pressure (IOP) • Definition: The pressure caused by the contents in the eyeball pushing on its wall. • Normal IOP (statistically normal range) 10 to 21 mmHg • Maintains of a stable IOP The rate of the aqueous production. The resistance to the outflow of aqueous passing through the trabecular meshwork. The level of the pressure in the episcleral vein.
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眼科学
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凡大医治病，必当安神
定志，无欲无求，先发大慈恻 隐之心，誓愿普救含灵之苦。
- - 孙思邈
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General Concepts
A. What is the glaucoma? A series of ocular diseases with excavated optic disc degeneration and visual field defect. The main risk factor is pathologically
General Concepts
F. Visual field defect The glaucomatous visual field defect can manifest as follow: at early stage there maybe paracentral scotomas and nasal steps, at developed stage there maybe arcuate scotoma, ring scotoma, or
juxtacanalicular meshwork corneoscleral meshwork uveal meshwork
General Concepts
E. Optic nerve damage The possible mechanisms of optic nerve damage are as follows: mechanical damage associated with increased IOP; damage associated with the deficiency of the blood circulation of the optic nerve head.
General Concepts
D. Anterior chamber angle is consist of the follow three components:The route of iris, the endothelium of cornea, and the trabecular meshwork.
General Concepts
C. Aqueous humor dynamics Aqueous production: ciliary body epithelium
Posterior chamber Pupil Anterior chamber Trabecular meshwork / iris Schlemm`s cannal / uveoscleral Collector channels route Episcleral vein
General Concepts
I. Classification of glaucoma Principal parameters: angle (open or closed) age of onset etiology (primary or secondary) Commonly classified as follow: congenital glaucoma primary glaucoma: PACG and POAG secondary glaucoma
microcirculation of the optic nerve head. 2. The direct mechanical theory suggests that elevated IOP directly damages the retinal nerve fibers as they pass through the optic nerve head.