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| residency2009 Total Posts: 25 | Posted: Wed Oct 29, 2008 05:46 pm Hi, Can anybody help me out with this mcq, how to arrive at the answer which is B For near point of 20 CMS, a Hypermetrope of +4D has to exercise accommodation of ? A) + 4.0 D B) + 9.0 D C) + 10.0 D D) 0 D thanks |
| superbdoc Total Posts: 273 | Posted: Wed Oct 29, 2008 06:41 pm The no of dioptres of accommodation needed to focus at a near point is inversely proportional to distance in metres. So at a near point of 20cms i.e 1/5 metres, an emmetropic eye has to exercise accomodation of +5 dioptres ; (N.B Correction to be applied: +5D for near fixation and +4D for hypermetropia) Here it is hypermetrope so he will have to accommodate +9 dioptres. Beware of twists in question esp wordings...SO dont mug up...Understand the basics thoroughly before committing..Ophthal is the toughtest and high standard always in AIIMS I hope my explanation helped cleared your doubt |
| residency2009 Total Posts: 25 | Posted: Wed Oct 29, 2008 07:15 pm thanks superbdoc for the wonderful explanation |