A young doctor has been asked to exclude open angle glaucoma. This can be done best by testing (AIIMS May 2012)
|A||Cupping of the disc|
|B||Depth of anterior chamber|
|C||Visual acuity and refractive error|
|D||Angle of the anterior chamber|
Open angle glaucoma
1. Anterior segment signs': Q or deep AC
2. Intra ocular pressure raised
3. Optic disc changes Q - confocal scanning laser Ophthalmoscopy (CSLO) is the most accurate and sensitive method for this purpose
a. Early glaucomatous changes,
1. Neuroretinal Rino thinning
2. Vertically oval cup,
3. Asymmetry of the cup, Q
4. Presence of splinter haemorrhage, pallor of the disc, atrophy of the retinal nerve Q fibre layer
5. Advance glaucomatous changes of optic disc, Marked cupping laminar dot sign"
6. Glaucomatous optic atrophy, cavernous optic atrophy optic nerve head appears white, deeply excavated (Bean pot cupping)
4. Visual field defect Q
a. Isopter contraction Q - It is the earliest visual filed defect occurring in glaucoma. (non-specific)
b. Baring of blind spot- Q it is also considered to be early glaucomatous change.
c. Small wing-shaped paracentral scotoma Q - it is the earliest clinically significant field defect (glaucoma specific; called as Bjerrum’s scotoma)
* most probably , by young doctor the examiner wants to indicate a under graduate whose expertise in ocular examination lies with torch examination. Of the given options , only anterior chamber depth can be examined with torch light relevant to glaucoma.