Second generation:Collamer™ (?) Fyodorov lens

Third generation: Staar ICL

-Material: Hydrophilic collagen polymer (63% hydroxy-ethyl-methyl-acrylate; 0.2% porcine collagen; 3.4% benzofenone for UV absorption)

-Water content: 34%-Refractive index: 1.45-Optical zone: 4.5-5.5 mm-11.0-13.0 mm long; 7.0 mm wide-Thickness: 50 m at the optic zone; 500-600 m at the

haptic zone; 100 m at the haptic footplates

Third generation:Staar ICL

Third generation: Medennium PRL

-Material: Highly purified silicone

-Refractive index: 1.46

-Optical diameter: 4.5-5.0 mm

-10.8 or 11.3 mm long

-6.0 mm wide

-“One-size-fits-all” design

-Not fixed in the ciliary sulcus; “floating” on the natural crystalline lens

Third generation:Medennium PRL

Phakic posterior chamber IOLs

• Cells involved in crystalline lens and capsular bag opacification• Evolution of designs of PPCIOLs• Relevant aspects of fixation and sizing• Sizing issue: New studies• Surgical implantation• Relationship between cataract and myopia• Cataractogenesis

• Specimens analyzed in our Center• Mechanisms• Review of the literature• Classification of cataracts after phakic IOL implantation?

Second generation:Chiron-Adatomed silicone lens

Second generation:Chiron-Adatomed silicone lens

Third generation: Staar ICL

-Consecutive “V” models with different vaulting characteristics in order to reduce the possibility of cataractogenesis

-Correct lens sizing is important:

too large excessive vaulting

too small instability/decentration

Third generation:Staar ICL

Oversized ICL

F. Trindade, MD, PhD, “Proper size, positioning of ICL are crucial”,Ophthalmology Times, October 15, 2000; 106.

Third generation:Staar ICL

F. Trindade, MD, PhD, “Proper size, positioning of ICL are crucial”,Ophthalmology Times, October 15, 2000; 106.

Central vault/midperipheral contact

Third generation:Staar ICL

F. Trindade, MD, PhD, “Proper size, positioning of ICL are crucial”,Ophthalmology Times, October 15, 2000; 106.

Undersized ICL

Third generation:Staar ICL

Trindade F, Pereira F. Exchange of a posterior chamber phakic intraocular lensin a higly myopic eye. J Cataract Refract Surg 2000; 26:773-776

(Composite UBM)