By American Academy of Ophthalmology, Steven I. Rosenfeld, MD
Reports the anatomy, body structure, embryology, and pathology of the lens. additionally offers an summary of lens and cataract surgical procedure, and describes the issues of surgical procedure.
Read or Download 2007-2008 Basic and Clinical Science Course Section 11: Lens and Cataract PDF
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Extra info for 2007-2008 Basic and Clinical Science Course Section 11: Lens and Cataract
This pattern is characteristic of viral or chlamydia conjunctiv itis. - A papillary pattern has vessels coming up the center of the tiny elevated lesion and is characteristic of bacterial or allergic conjunctivitis. • The discharge in bacterial conjunctivitis is typically more purulent than the watery discharge of viral conj unctivitis. Thus, there is more "mattering" of the lid margins and associated difficulty in prying the lids open following sleep. • In uncomplicated bacterial conjunctivitis, slit lamp examination reveals a quiet anterior chamber that has not visible cells.
Investigations The cause of trachoma is certain subtypes of chlam ydia trachoma tis, a bacterium tha t can also cause the sexuall y tra nsmitted disease, chlamyd ia. Trachoma spreads through contact with disch arge from the eyes or nose of an in fected person. H ands, clothing, towels and iJ1sects can all be routes for traJ1smission. In the developing countries, flies are a major means of transmission. Differential Diagnosis Some other inflam matory conditions of the cornea and conj unctiva, like Cicatricial Pemphigoid and Stevens-Johnson.
Developmental Abnormalities Figs 3 and 4: Peters anomaly 23 Anterior Segment D iseases Clinical Signs and Symptoms Corneal opacity is always present; it can be central, paracentral, or cOlnplete. Usu ally, no vasc ularization of this opacity occurs; th is data is helpful in distinguish it from other causes of congenital corneal opacity. Some investigators have classified Peters anomaly in two groups: • Type 1: Only 80% of the cases are bilateral. There is n ot a complete corneal op acity; there is only a central or paracentral annular opacity.