Dual optic accommodating lenses


Recognising these limitations, Hara This design was later replaced by a pair of inflexible polymethylmethacrylate optics, 6 mm in diameter, connected by four peripheral closed polyvinylidene fluoride flexible loops separating the optics by 3.0 mm.



Ray tracing analysis, however, suggests that such designs are expected to produce varying degrees of accommodation depending upon the power of the lens implanted.RESULTS: Ray tracing analysis indicated that axial movement of an exaggerated converging anterior optic linked by spring loaded haptics to a compensatory static diverging posterior optic produced greater change in conjugation power of the eye compared to axial movement of a single optic lens.A dual optic one piece foldable silicone lens was constructed and implanted via a 4 mm corneal incision into the capsular bag of two cadaver eyes.Attempts have been made to replace the crystalline lens by refilling the capsular bag with appropriately deformable gels.

However, this approach is limited by the intrinsic mechanical instability of such materials that cannot be expected to retain a specific shape (and thus optical power) over time while sustaining a rapid, constant, and predictable response to equatorial tension as demanded by the dynamics of accommodation.

At ciliary body rest, the zonules are put on stretch producing axial shorting of the capsular bag, thus pulling the optics together and loading the haptic springs.