INTRODUCTION: Conventional intraocuiar lenses (10Ls) that focus light
at a fixed distance provide excellent visual outcomes in most patients
who have cataract extraction. However, most patients require reading
glasses or bifocals for near vision. Steinert et at (1999).
Replacing the natural lens with a multifocal intraocu kw lens that provides
multiple focal distances for both near and distance vision offers an
alternative to patients who need near vision correction after cataract surgery,
Woiffsohn, et at. (2006). The optical quality of the retinal image is
worse than the retinal image produced with a monofocal IOL. The loss of
image quality can affect visual performance and has led to an interest in
alternative modalities for correcting near vision in pseudophakic patients,
Steinert et at (1999).
By using the new accommodating 10Ls, ophthalmic surgeons will be
able to provide a full range of visual focus in each eye of a patient to
maintain binocular function while also avoiding visual disturbances that
are experienced with monovision and multifocal 10Ls, Doane (2004) .
The CrystnItms AT-45 (Eyeonics), is an accommodating, foldable, multi-
piece plate shaped 10L. (Eyeonics Crystalens fact sheet).
AIM OF THE WORK: This research was designed to study the efficiency
of the foldable accommodating IOL; Crystalens (AT-45) in the restoration
of both distant and near visual acuity after phacoernulsification.
Also, assessment of the 10L's possible displacement during accommodation
and the accompanying modifications of the ciliary body and anterior
chamber depth by using ultrasound biomicroscopy (UBM). |
