True statements regarding Direct Ophthalmoscopy are all except:
(A) Image is viual and erect (B) 2 disk diameter field of vision (C) Magnification is 5 times (D) Self-illuminated device
(C) Ans: C. Magnification is 5 times(Ref Parson's 22/e p137-139. 20/c p126-133).In direct ophthalmoscopy magnification = 15 times.In indirect ophthalmoscopy, magnification = 4-5 times.FeaturesDirect ophthalmoscopyIndirect OphthalmoscopyCondensing lensNot requiredRequired (Convex Examination distanceAs close to patient's eye as possibleAt an arm's lengthImageViual, erectdegReal, inveedMagnificationAbout 15 timesdeg4-5 timesdegIlluminationNot so bright, so not useful in hazy Bright, so useful for hazy Area of field in focusAbout 2 disc dioptersdegAbout 8 disc dioptersdegStereopsisAbsentPresentAccessible fundus viewSlightly beyond equatorUp to Ora serrata i.e. PeripheralretinadegExamination through hazy Not possiblePossibledegPatient positionSittingSupineEaseEasy procedure for visualization ofposterior pole of retinaDifficult, require training