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. 2017 Jan 18;10(1):103-108.
doi: 10.18240/ijo.2017.01.17. eCollection 2017.

Objective assessment of the effect of pupil size upon the power distribution of multifocal contact lenses

Eleni Papadatou  1 , Antonio J Del Águila-Carrasco  1 , José J Esteve-Taboada  1 , David Madrid-Costa  2 , Alejandro Cerviño-Expósito  1
Affiliations

Objective assessment of the effect of pupil size upon the power distribution of multifocal contact lenses

Eleni Papadatou et al. Int J Ophthalmol. .

Abstract

Aim: To analytically assess the effect of pupil size upon the refractive power distributions of different designs of multifocal contact lenses.

Methods: Two multifocal contact lenses of center-near design and one multifocal contact lens of center-distance design were used in this study. Their power profiles were measured using the NIMO TR1504 device (LAMBDA-X, Belgium). Based on their power profiles, the power distribution was assessed as a function of pupil size. For the high addition lenses, the resulting refractive power as a function of viewing distance (far, intermediate, and near) and pupil size was also analyzed.

Results: The power distribution of the lenses was affected by pupil size differently. One of the lenses showed a significant spread in refractive power distribution, from about -3 D to 0 D. Generally, the power distribution of the lenses expanded as the pupil diameter became greater. The surface of the lens dedicated for each distance varied substantially with the design of the lens.

Conclusion: In an experimental basis, our results show how the lenses power distribution is affected by the pupil size and underlined the necessity of careful evaluation of the patient's visual needs and the optical properties of a multifocal contact lens for achieving the optimal visual outcome.

Keywords: multifocal contact lenses; power profiles; pupil size; refractive power distribution.

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Figures

Figure 1
Figure 1. Power distribution (%) as function of pupil size (3.00 mm, 4.50 mm and 6.00 mm) for each available addition power of the Acuvue Oasys for presbyopia lens
A: Low-addition lens; B: Mid-addition lens; C: High-addition lens.
Figure 2
Figure 2. Power distribution (%) as function of pupil size (3.0 mm, 4.5 mm and 6.0 mm) for the Fusion 1d Presbyo lens.
Figure 3
Figure 3. Power distribution (%) as function of pupil size (3.00 mm, 4.50 mm and 6.00 mm) for three addition powers of the Biofinity CN lenses
A: +1.50 D; B: +2.00 D; C: +2.50 D.
Figure 4
Figure 4. Proportion of the lens surface dedicated to different distances (far, intermediate and near vision) as a function of pupil size
A: Acuvue Oasys for presbyopia (high addition); B: Fusion 1d Presbyo; C: Biofinity CN multifocal (+2.50 D addition power).
See this image and copyright information in PMC

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