Based on Hemholtz's
theory of accommodation, Optiflex MO/F-016 is an accommodative
lens plus CTR, which addresses the problem of pseudophakic
presbyopia. Implantation through a standard phaco incision
of sub 2.6 is facilitated by this IOL. The lens have
a six haptics design with anterior vaulting which let
the lens move and focus on objects at various distances
without creating any hysterisis. The accommodation effect
is maintained by the posteriorly vaulted haptics which
ensure minimum adhesion to anterior subcapsular cells
for a longer period of time. A continuous CTR is formed
by the diminishing gap betwen six haptics during the
capsular bag contraction process, which postpones PCO.
As shown in the diagram below (fig:1.1), during normal
conditions (far focus), the angle of the lens is reduced
by the flattened capsular bag membrane and enlarges
the overall focal distance of the lens. The contraction
of ciliary body and the subsequent release in the resting
tension of the zonular fibres by which the crystalline
lens is suspended create an accommodative effect which
results in anterior movement of the optic, which furthermore
creates a change in focus. The curvature of the optic
also increases during this process, providing further
change in focus as shown in fig: 1.2 and fig: 1.3. An
estimated displacement of the axis noted will be 0.25-
1.0 mm resulting in an accommodation of over 1.5 D. |