supply of foldable intra ocular lens for phaco - emulsification procedure, hydrophobic, single piece a nd aspheric specifications: 1) foldable hydrophobic acrylic single piece aspheric lens made of hydrophobic acrylic material and not hydrophobic surface treatment. 2) optic with 360 degree sharp square edge. optic diameter 5.75 to 6 mm. with 0 degree optic angulation 3) overall diameter 12.5mm to 13 mm. 4) refractiv e index 1.51 to 1.55. 5) optic with uv absorbing properties. 6) natural yellow chromophore colour for blocki ng blue light. 7) iol preloaded in teflon coated polished cartridge in pre-fitted injector. the whole unit of pr eloaded iol in injector is to be supplied in a sterile pack 8) a constant: ultrasound 118.8-118.9, optical 119 -119.1. 9) to submit a sample along with the tender for inspection. 10) facility for exchange of iol for the d ioptric matching of iol with individual patient to be arranged at the hospital premises and whenever requir ed within 12 hours, irrespective of the duration from date of purchase till the consumption of the lens is exh austed. 11) the manufacturer must have office and store with large stock of iol in kolkata/kolkata suberb f or providing the facility of exchange for diopter matching 12) satisfactory performance report of iol from pr eferably railways or govt. institute. [ warranty period: 30 months after the date of delivery ] ]