Corneal Opacity - Corneal Opacity 24 December 2011 Prof...

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24 December 2011 Prof Sanjay Shrivastava 1 Corneal Opacity
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24 December 2011 Prof Sanjay Shrivastava 2 Corneal Opacity Corneal opacity results from Corneal scarring, due replacement of normal corneal lamellae with fibrous scar tissue. Whenever Bowman’s membrane is destroyed some opacity remains The opacification is due to disturbance of arrangement of corneal lamellae
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24 December 2011 Prof Sanjay Shrivastava 3 Types Types of Corneal opacity, depending on density of corneal opacity: 1. Nebular (Nebula) Corneal Opacity is slight opacification of cornea allowing the details of iris and pupil to be seen through corneal opacity
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24 December 2011 Prof Sanjay Shrivastava 4 Types 2. Macular (Macula) Corneal opacity: it is more dense than nebular corneal opacity, through it details of Iris and pupil cannot be seen but margins can be seen 3. Leucomatous (Leucoma) Corneal Opacity: it is very dense, white totally opaque obscuring view of iris and pupil totally
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24 December 2011 Prof Sanjay Shrivastava 5 Types Old leucomatous opacity may show horizontal pigmented line/ calcareous deposits in palpabral aperture When iris is adherent to leucomatous corneal opacity, which develops following healing of perforation of corneal ulcer, the condition is called adherent leucoma.
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24 December 2011 Prof Sanjay Shrivastava 6 Types If iris is incarcerated in the scar tissue which forms as a result of healing of sloughed corneal ulcer it is called Corneoiridic scar (if flat) and anterior staphyloma if it is ectatic (ectatic cicatric with incarceration/ incorporation of Iris is called anterior staphyloma)
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24 December 2011 Prof Sanjay Shrivastava 7 Classification based on location
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24 December 2011 Prof Sanjay Shrivastava 8 Peripheral Corneal Opacity 1. Nebular : does not interfere with visual axis, may cause some astigmatism. It does not cause cosmetic disfigurement
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24 December 2011 Prof Sanjay Shrivastava 9 Peripheral Corneal Opacity Macular : does not interfere with visual axis, may cause some astigmatism. It causes some cosmetic disfigurement
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24 December 2011 Prof Sanjay Shrivastava 10 Peripheral Corneal Opacity Leucomatous : does not interfere with visual axis, may cause some astigmatism. It causes cosmetic disfigurement
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24 December 2011 Prof Sanjay Shrivastava 11 Peripheral Adherent Leucoma
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24 December 2011 Prof Sanjay Shrivastava 12 Central Corneal Opacities
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24 December 2011 Prof Sanjay Shrivastava 13 Nebular Corneal Opacity A nebular corneal opacity in pupillary area causes more visual disturbance by causing irregular refraction of light rays compared to macular and leucomatous corneal opacities (occupying partial pupillary area). The partial pupillary macular and leucomatous Corneal opacities only decreases contrast (patient can still see objects, as light rays enters from peripheral area)
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24 December 2011 Prof Sanjay Shrivastava 14 Nebular Corneal Opacity The visual disturbance (distortion is more marked in cases of nebular corneal opacity) Superficial corneal opacities does clear with time specially in children
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Corneal Opacity - Corneal Opacity 24 December 2011 Prof...

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