POSTERIOR CORNEAL DYSTROPHIES

Cornea Guttata of vogt
This condition is characterised by drop-like excrescences involving the entire posterior surface of Descemet's membrane. These are similar to Hassal- Henle bodies which represent the age change and are mainly found in the

Anterior corneal dystrophies

ANTERIOR DYSTROPHIES

Epithelial basement membrane dystrophy
Also known as Cogan's microcystic dystrophy and
map-dot finger print dystrophy, is the most common
of all corneal dystrophies seen in working age adults.
The typical lesions, involving corneal

corneal AGE-RELATED DEGENERATIONS

Arcus senilis
Arcus senilis refers to an annular lipid infiltration of corneal periphery. This is an age-related change occurring bilaterally in 60 percent of patients between
40 and 60 years of age and in nearly all patients over the age of 80. Sometimes, similar changes occur in young persons (arcus juvenilis) which may or may
not be associated with hyperlipidemia. The arcus starts in the superior

Syphilitic (luetic) interstitial keratitis

INTERSTITIAL KERATITIS
Interstitial keratitis denotes an inflammation of the corneal stroma without primary involvement of the epithelium or endothelium.

Causes. Its common causes are:
Congenital syphilis
Tuberculosis
Cogan's syndrome
Acquired syphilis
Trypanosomiasis
Malaria
Leprosy
Sarcoidosis

Syphilitic (luetic) interstitial keratitis
Syphilitic interstitial keratitis is associated more frequently (90 percent) with congenital

ROSACEA KERATITIS

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ROSACEA KERATITIS is defined as : Corneal ulceration is seen in about 10 percent cases of acne rosacea, which is primarily a disease of the sebaceous glands of the skin.

Clinical features
1. The condition typically occurs in elderly women in the form of facial eruptions presenting as butterfly configuration, predominantly involving
the malar and nasal

EXPOSURE KERATITIS

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Normally cornea is covered by eyelids during sleep and is constantly kept moist by blinking movements during awaking. When eyes are covered insufficiently by the lids and there is loss of protective mechanism of blinking the condition of exposure

NEUROPARALYTIC KERATITIS

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Neuroparalytic keratitis occurs due to paralysis of the sensory nerve supply of the cornea.
Causes

 
I. Congenital
1. Familial dysautonomia (Riley-Day syndrome)
2. Congenital insensitivity to Pain.
3. Anhidrotic ectodermal dysplasia.
II. Acquired
1. Following alcohol-block or electrocoagulation of Gasserian ganglion or section of the sensory root of trigeminal nerve for trigeminal neuralgia.
2. A neoplasm pressing on Gasserian