[Invisible Cataract]

To report two cases of oil-drop cataract the description of this entity. Two women [one 46 and the other 56 years old] presented with gradual visual loss. Previous studies including CT scan, MRI, VEP and ERG were normal. With the use of simple diagnostic tests including a multiple pinhole occluder and use of visuscope, a diagnosis of oil-drop cataract was made in both cases. In cases with progressive visual acuity loss without definite etiology, negative RAPD and normal color vision, oil-drop cataract should be considered as a possibility. Visuscope and multiple pinholes are effective methods for confirming the diagnosis

[Vitreopapillary traction in non-arteritie anterior ischemic optic neuropathy]

To describe the association between optic disc traction and non-arthritic anterior ischemic optic neuropathy [NAION].eighty three eyes of 83 patients with NAION were evaluated by optical coherence tomography [OCT] for detecting vitreous adhesion to the optic never head with separation form adjacent retina [partial posterior vitreous detachment]. Those who were negative for such adhesion underwent ultrasonography to detect complete PVD. Fifty male and 33 female subjects with mean age of 51.9 +/- 10yr were studied. Partial PVD with optic never head adhesion was found in 54 patients [65.1%] using OCT. Ultrasonography found complete PVD in all eyes with optically empty spaces in OCT. Vitreous traction on optic never head from PVD may play a causative role in some cases of NAION. This traction may impair vascular supply and axoplasmic flow leading to signs and symptoms of NAION