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Vienna 2018 Delegate Registration Programme Exhibition Virtual Exhibition Satellites 2018 Survey


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Repeatability of the multifocal acceptance score (MAS)

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Session Details

Session Title: Ocular Surface & Quality of Vision

Session Date/Time: Monday 24/09/2018 | 14:00-16:00

Paper Time: 14:48

Venue: Room A3, Podium 1

First Author: : X.Barcala Gosende SPAIN

Co Author(s): :    M. Romero   M. Vinas   J. Mendez-Gonzalez   E. Gambra   C. Dorronsoro   S. Marcos     

Abstract Details


The standard method to assess performance of multifocal corrections is through-focus visual acuity, but it is time-consuming and does not capture the multidimensionality of vision. MAS is a new clinical metric based on perceptual scoring of multiple day and night visual scenes in near and far vision and stereovision. The metric is aimed at estimating visual perception with multifocal corrections (for example contact lenses) and it is particularly well suited in combination with visual simulators (i.e. SimVis). We evaluated the intrasubject repeatability and the sensitivity of the metric to reveal differences across different presbyopic corrections and patients.


Visual Optics and Biophotonics Laboratory (Viobio lab), Instituto de Optica, Spanish National Research Council (IO-CSIC), Madrid, Spain.


MAS stimuli were presented in a 3-D monitor (UHD-HDR) and a tablet (iPad-Retina). Patients judged the perceived quality (PS, 0-10 range) of the images (day and night scenes and stereo stimulus) with a given correction. 5 cyclopeged subjects (22 – 38 yo) were measured with 4 different binocular corrections: 1)Binocular Monofocal-Far; 2)Binocular Multifocal; 3)Monofocal-far in sensory dominant eye (SDE) + Monofocal-near in fellow eye 4)Monofocal-far in SDE + Multifocal. The corrections were given in form of Contact Lenses (Cooper Biofinity Monofocal or Multifocal) and with SimVis. Measurements were done in 2 sessions with 5 randomized repetitions (32 conditions in total).


All subjects used all the PS range, with averages ranging from 8.9 to 2.0 PS. The Standard Deviation across repetitions was 0.52 PS on average across subjects (0.37 to 0.75). An n-way ANOVA analysis was performed for the 1600 measurements with 4 variables (subjects, corrections, near/far, day/night). When the 10 repetitions are considered, distance, subject and correction, in that order, are statistically relevant variables (p<1e-7); also 4 out of 6 crossed interactions (p<0.002) (except correction*light and subject*light). 2 repetitions are enough to infer statistical differences among corrections and subjects.Those results apply to both CLs and SimVis.


The high intrasubject repeatability of the MAS test decreases drastically the necessary number of repetitions (2), making the metric very suitable for use in the clinic (<2 min per test). The statistically significant differences across presbyopic corrections and subjects in the MAS metric demonstrate its high sensitivity. The MAS metric in combination with SimVis can be used pre-operatively and/or in the prescription of multifocal lenses, and reduce considerably the time to select the optimal presbyopic correction.

Financial Disclosure:

... has significant investment interest in a company producing, developing or supplying product or procedure presented, ... is employed by a for-profit company with an interest in the subject of the presentation

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