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DRY EYE: INNER MUCIN LAYER
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Friday, January 11, 2008. This is secreted by the conjunctival goblet cells, the crypts of Henle and the glands of Manz. Wetting of the cornea by converting the dorneal epithelium from a hydrophobic to a hydrophilic surface. 2)Deficiency of this may be a feature of both hypo secretive and evaporative states. The tear film is mechanically spread over the ocular surface through a neuronally controlled blinging mechanism and after a period of time is cleared through the nasolarcrimal drainage system .
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DRY EYE: CAUSES:
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Friday, January 11, 2008. The term ‘dry eye’ and ‘keratoconjunctivitis sicca’(KCS) are synonymous. The two main categories: (a) hypo secretive,which may be sjogren, and (b) evaporative, although the two are mutually exclusive. Subscribe to: Post Comments (Atom). Preservation of existing tears :. Reduction of tear drainage:.
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DRY EYE: SPECIAL INVESTIGATIONS :
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Friday, January 11, 2008. Tear film break -up time:. The tear film break-up time(BUT)is an index of precorneal tear film stability. It is measured as follows :. A Fluorescien is instilled into the lower forix. B The patient is asked to blink several times and then stop. C The tear film is examined with a broad beam and a cobalt blue filter . After an interval of time, black spots or line indicating the formation of dry areas will appear . Subscribe to: Post Comments (Atom). Reduction of tear drainage:.
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DRY EYE: ROSE BENGAL:
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Friday, January 11, 2008. This dye has an affinity for dead or devitalized epithelial cells and mucus. It stains the exposed bulbar conjunctiva, resulting in the typical staining pattern of two triangles with their bases at the limbus. Corneal filaments and plaques are also shown up more clearly by the dye. Subscribe to: Post Comments (Atom). Preservation of existing tears :. Reduction of tear drainage:.
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DRY EYE: Tear substitutes
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Friday, January 11, 2008. Subscribe to: Post Comments (Atom). Preservation of existing tears :. Reduction of tear drainage:.
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DRY EYE: OUTER LIPID LAYER:
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Friday, January 11, 2008. This is secreted by the meibomian glands. To retard evaporation of the aqueous layer of the tear film. To lower surface tension of the tear film. This, in turn, draws water into the tear film and thickens the aqueous layers. To lubricate the eyelids as they pass over the surface of the globe. 2) Dysfunction of this layer may result in an evaporative dry eye. Subscribe to: Post Comments (Atom). Preservation of existing tears :. Reduction of tear drainage:.
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DRY EYE: January 2008
http://dryeyesyndrome.blogspot.com/2008_01_01_archive.html
Friday, January 11, 2008. The main lacrimal glands produce about 95% of the aqueous component of tears and the accessory. Lacrimal glands of Krause and the Wolforing produce the remainder. Secretion of tears has basic. Resting) and much greater reflex components. Reflex secretion occurs in response to corneal and conjunctival sensory stimulation, tear break-up and dry spot formation or ocular inflammation. Each of this have separate functions. This is secreted by the meibomian glands. 2) Deficiency of th...
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DRY EYE: TREATMENT:
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Friday, January 11, 2008. The main for the treatment of KCS are to remove the discomfort ,provide a smooth optical surface and to prevent structural corneal damage . One or more of the following measure may be used simultaneously . Subscribe to: Post Comments (Atom). Preservation of existing tears :. Reduction of tear drainage:.
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DRY EYE: Mucolytic agents
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Friday, January 11, 2008. Acetylcysteine 5% drops may be useful in patients with corneal filaments and mucous plaques. They are used q.i.d. and may cause irritation following instillation. It has a limited bottle life ,so that it can only be used for up to 2 weeks. Subscribe to: Post Comments (Atom). Preservation of existing tears :. Reduction of tear drainage:.
