Distance of distant direct ophthalmoscopy:
Distant Direct Ophthalmoscopy Distance at which DDO performed is 25cm done with direct ophthalmoscope. contains light source viewing window. Normally red glow seen Interpretations Red glow= healthy retina Grey glow = Retinal Detachment No glow = vitreous haemorrhage Black spot in centre = cataract or corneal opacity GOLD STANDARD FOR LOCATING SUBLUXATED LENS: DDO
25 cms
50 cms
75 cms
100 cms
Optics and Errors of Refraction