Reading speed comparison between the distance and the near power of a multifocal IOL

Session Details

Session Title: Biometry & Quality of Vision

Session Date/Time: Tuesday 25/09/2018 | 08:00-10:30

Paper Time: 10:06

Venue: Room A2

First Author: : C.Bellucci ITALY

Co Author(s): :    R. Bellucci                    

Abstract Details

Purpose:

With multifocal IOLs the near focus receives less light than the distance focus, resulting in lower MTF and lower contrast sensitivity. However, the distance power can be spectacle corrected for near, and this should improve near vision. We tested this hypothesis using reading speed measurement, in binocular vision, in 20 patients bilaterally implanted with the POD F trifocal apodized IOL, and with CDVA of 0.2 LogMAR or better

Setting:

Private ophthalmic office facility

Methods:

Age of patients was 687 y. A near vision optotype was used, with Jaeger 4, 3, and 2 print size. Distance was 35 cm from the eyes, and illumination was 300 lux. The patient read 2 sets of standardized sentences per print size, one with the distance correction (testing the near focus of the IOL) and one with +3 D added to the distance correction (testing the distance focus of the IOL), in random order. The reading speed was recorded for each print size and optical correction. No adjustments were made to compensate for image magnification.

Results:

For the Jaeger 4 print size the reading speed was 27.24.4 sec for the near focus, and 28.53.6 sec for the distance focus-near corrected (P=N.S.). For the Jaeger 3 print size the figures were 35.85.5 sec for the near focus, and 32.64.3 sec for the distance focus-near corrected (P<0.05). For the Jaeger 2 print size the figures were 41.78.1 sec for the near focus, and 33.86.4 sec for the distance focus-near corrected (P<0.01).

Conclusions:

In this study, the reading speed at the near focus was similar to the reading speed at the distance focus (near corrected) down to the Jaeger 4 print size. It was lower with the smaller Jaeger 3 print, and especially for the Jaeger 2 print size. Image magnification due to the positive near add may have influenced the result. Despite the ability of multifocal IOL to provide good near vision, the reading speed can be improved by correcting for near the distance focus of the IOL.

Financial Disclosure:

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