corneal ulcer Pathogenesis and pathology

Pathology of corneal ulcer Once the damaged corneal epithelium is invaded by the offending agents the sequence of pathological changes which occur during development of corneal ulcer can be described under four stages, viz., infiltration, active ulceration, regression and cicatrization. The terminal course of corneal ulcer depends upon the virulence of infecting

DEVELOPMENT OF THE EYE MILESTONES

Embryonic and fetal period

Stage of growth   ::   Development

2.6 mm (3 weeks)           Optic pits appear on either side of cephalic end of forebrain.

3.5 mm (4 weeks)           Primary optic vesicleinvaginates.

5.5 to 6 mm

iris eye , vitreous eye , eyelid anatomy

Iris

• Both layers of epithelium are derived from
  the marginal region of optic cup (neuroectodermal)
• Sphincter and dilator pupillae muscles are
  derived from the anterior epithelium (neuroectodermal).
• Stroma and blood vessels of the iris develop
  from the vascular mesenchyme present anterior
  to the optic cup.

Vitreous
1. Primary or primitive vitreous is mesenchymal in
origin and is a vascular structure having the
hyaloid system of vessels...