Primary open angle glaucoma: an increase in resistance to the
outflow through the trabecular meshwork in the angle of the anterior chamber
causes a rise in the IOP. This type develops slowly and the symptoms may not be
obvious till the damage to the optic nerve has occurred. The patient may lose
peripheral vision, leaving only central or 'tunnel' vision.
Primary angle closure glaucoma : due to acute, sub acute,
creeping or chronic closure of the anterior chamber angle, blocking outflow of
aqueous fluid through the trabecular meshwork. In the rarer acute cases, the
symptoms are dramatic and may include severe pain in the eye, headache, nausea,
reduced vision, and seeing rainbow colored rings around lights.
 Developmental glaucoma:
which may be further divided into congenital glaucoma (in infants from birth)
and juvenile glaucoma (in children and young adults). It is characterized by
improper development of the eye’s aqueous outflow system.
Secondary : Common causes
- Iridocyclitis,
- Trauma,
- Cataract,
- Neo-vascular glaucoma à Following CRVO or proliferative diabetic retinopathy.
- Drugs – Steroids etc.
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