Extra capsular extraction of lens is not possible in:
Ans: C (Lens subluxation) Ref: www.eiournalofophthalmology.com/ejo/ejo18.htmlv; BASAK Essentials of Ophthalmology,5th edition, pg no 254,260Explanation:ECCE - It involves the excision of the central part of the anterior capsule Followed by the expression of the nucleus & placement of the IOL in the remaining capsular bag.Capsule with zonules should be intact so the IOL placed will be in pupillary axis.ICCE - The whole crystalline lens including the capsule is removed.Subluxated lens:Partially displaced lens still remaining in the pupillary region.Causes:Familial ectopia lentisEctopia lentis et papillaeAniridiaMarfan's syndrome Homocystinuria Weill marchesani syndromeManagement of subluxated lens:Zonular dialysis < 90 degrees - Capsular tension ring with ECCE90 - 270 degrees - Modified CTR with loops with ECCE> 270degrees - ICCE & anterior vitrectomy with ACIOL. iris fixated IOL or sclera fixated IOLCapsular tension ring: Fine PMMA made ring which is placed within the capsular hag to give support to the zonules thereby preventing the decenteration of the IOL.
Surgical Techniques for Cataract Extraction
Hypermature cataract
B Immature cataract
Lens subluxation
Developmental cataract
Lens subluxation