The Tetraflex KH-3500 IOL is a one-piece, hydrophilic acrylic lens with a unique adjustment mechanism independent of vitreous pressure. Its haptic angle allows the lens to move with the entire capsular bag. It is the most effective among the many adjustable IOLs in clinical use. Preferred patients are drivers, sewers, physicians, technicians and others who work in close proximity; those with high requirements for near vision. No severe ciliary muscle system disorders Corneal astigmatism less than 1.5D No contraindication to lens implantation Adequate preoperative preparation Precise IOL measurement technique Skilled cataract ultrasound emulsification technique Perfect toric tearing technique with intact capsular bag Standard capsular opening size (4-5mm) Benefits: Perfect total vision No halos or glare Comfortable vision at any distance