<prompt> Intraoccular lenses are made up ofPMMMHydrophilic acrylicSiliconAll of the above  <response>: Ans. d. All of the above. Ref. Parsons, disease of Eye, 19th 296, Basak, Ophthalmology, 2nd324IOL IOL implantation was first performed by Dr. Harold Ridley 1949. Material used for manufacturing IOL:Optic materialHaptic materialNon foldableFoldablePolypropylene PMMAAcrylicPolymethyl methacrylate PMMASiliconeHydrophobic acrylicHydrophilic acrylic A USG machine equipped with A scan and IOL power calculation software is known as biometry.Calculation of IOL power PP A- 2.5 L-0.9kWhere, P Power of IOL. A Constant specific for each lens type. L Axial length of eye ball in mm by A scan. K Angular corneal curvature by Keratometry.IOL implantation is of 2 typesPrimary at the same sitting with operation and Secondary after operation of cataract surgeryTypes of IOLACIOL outdated and PCIOL routinely; ECCEParts of IOLOptic and Haptic anchors IOL in positionSterilization of IOLBy ethylene oxideContraindications for IOL- Congenital bilateral cataract.- Uncontrolled glaucoma.- Corneal endothelial dystrophy.- Proliferate diabetic retinopathy.- Recurrent anteriorposterior segment inflammation.- One eyed patient.- Complicated IOL implantation in other eye. 