CRAO and CRVO

CRAO

  1. Carotid atherosclerosis is commonest cause of CRAO in elderly
  2. In young-Cardiac emboli.
  3. CAttle trucking appearance

Mnemonic:CRAO=CAttle

Treatment:

  1. Paracentesis by letting out
  2. Mannitol,acetazolamide
  3. Carbogen mixture-Inhaled CO2 ,causes systemic vasodilation.

CRVO

Ischaemic and NonIschaemic types

Vision<6/60

RAPD

Retinal hemorrhages

Vision loss is due to macular edema due to venous occlusion

Nonishaemic type is converted to ischaemic type in normal course of disease

Appearance of IRIS/Angle neovascularization-Indication for LASER photocoagulation.

Hundredth day glaucoma-CRVO,neovascularization in 3rd month.

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