Evaluation of a Bi-Toric Trifocal Multifocal IOL
Clinical evaluation of near, intermediate and distance visual acuity with a new bi-toric, trifocal multifocal intraocular lens for the correction of corneal astigmatism in presbyopic cataract surgery.
In a prospective study we evaluated the functional outcome of cataract patient’s receiving a bi-toric, trifocal multifocal intraocular lens (AT LISA toric multifocal MIOL, Carl Zeiss Meditech) 3 month after surgery. Examinations included UDVA (ETDRS 4m), UIVA (ETDRS 80cm), UNVA (ETDRS 40cm) as well as CDVA, DCIVA and DCNVA [logMAR] in the same distances. Additionally we performed visual acuity testing’s in set and individual distances (uncorrected and distance corrected) with the use of the Salzburg Reading Desk.
Median binocular UDVA was -0.08, UIVA was –0.12 and UNVA 0.00 compared to a CDVA of -0.10, a DCIVA of -0.12 and a DCNVA of -0.06 [logMAR]. Regarding the Salzburg Reading Desk evaluation a binocular, objective UNVA (39.4 cm) of 0.11 similar to a subjective UNVA (38.9cm) could be found. Fort he intermediate range the objective UIVA was 0.09 (80.0cm) compared to a subjective UIVA of 0.03 (78.2cm).
The bi-toric, trifocal multifocal intraocular lens offers a high amount of spectacle independence for daily tasks. Small postsurgical refractive errors can be balanced by the wide range of focus of those types of lenses.