- Stage 2. This is characterised by the spreading of these droplets across the cornea to involve the epithelium of the central area and the lower half of the cornea. Vision is 6/12 or less. In some cases there is pigment migration from the conjunctiva on to the cornea in the interpalpebral area.
- Stage 3. This is characterised by an increase in the size of the droplets, which begin to invade the deeper part of the epithelium and the superficial parts of the stroma. These droplets now form yellow nodules which protrude above the surface of the epithelium. Vision is 6/24 or less.
- Stage 4. In this stage the nodular swellings erode through the epithelium, causing deep ulcers involving epithelium and stroma. Corneal sensation is diminished or absent in the involved area and vision is severely impaired (6/60 or less). The lesions remain painless and the cornea is not vascularized.
- Stage 5. The corneal lesions become denser and deeper and the involved cornea shows vascularization which is a result of recurrent secondary infections. Vision is less than 1/60.
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