July 2019
Volume 60, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2019
THEORETICAL MODEL TO PREDICT USABLE AREAS OF A PROGRESSIVE LENS FOR READING IN COMPUTER SCREENS
Author Affiliations & Notes
  • Jose Miguel Cleva
    IOT, Madrid, Spain
  • Eva Chamorro
    IOT, Madrid, Spain
  • Carolina Gago
    IOT, Madrid, Spain
  • Amelia Gonzalez
    IOT, Madrid, Spain
  • Pablo Concepcion
    IOT, Madrid, Spain
  • Jose Alonso
    IOT, Madrid, Spain
  • Footnotes
    Commercial Relationships   Jose Miguel Cleva, Indizen Optical Technologies, SL (E); Eva Chamorro, Indizen Optical Technologies, SL (E); Carolina Gago, Indizen Optical Technologies, SL (E); Amelia Gonzalez, Indizen Optical Technologies, SL (E); Pablo Concepcion, Indizen Optical Technologies, SL (E); Jose Alonso, Indizen Optical Technologies, SL (E)
  • Footnotes
    Support  none
Investigative Ophthalmology & Visual Science July 2019, Vol.60, 3720. doi:
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      Jose Miguel Cleva, Eva Chamorro, Carolina Gago, Amelia Gonzalez, Pablo Concepcion, Jose Alonso; THEORETICAL MODEL TO PREDICT USABLE AREAS OF A PROGRESSIVE LENS FOR READING IN COMPUTER SCREENS. Invest. Ophthalmol. Vis. Sci. 2019;60(9):3720.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : It is assumed that progressive lens(PPL) users tends to mostly use the corridor area of the lens for reading at intermediate distances. But, other areas designed for distance or near vision can also be used depending on prescribed addition, accommodation amplitude(AA) and working distances. Using previously reported data on AA and prescribed addition vs age, the regions of the PPL that are usable for a given working distance can be predicted. The purpose of this study is to experimentally check these predictions when using computer screens.

Methods : 9 PPL presbyopic subjects were asked to use PPL glasses that were marked with a template having 2 color lines located at 10% and 90% of the addition that separated the distance (D), intermediate (I) and near (N) areas of the lens. The subjects were asked to read text in both a computer and a laptop screen located at 65cm and 80cm. Reading texts had letter sizes of 7, 9 and 12 points and were composed of 3 paragraphs located at the top, medium and bottom of the screens. For each of the 36 reading situations, the subjects indicated the lens area used for reading: distance (over first line), near (under second line) or corridor (between both lines). Correlation between theoretical and experimental data was analyzed.

Results : The theoretical model predicts that subjects with Add≤1.25D can use the whole lens for seeing at distances between 65-80cm. Experimentally, the percentage of use of each area were D=33%, I=67%, C=0% at 65cm and D=25%, I=75%, C=0% at 80cm. Subjects with Add=1.50D will theoretically use the corridor and near areas for reading at 65cm but they will use the distance and corridor area for seeing at 80cm. Experimental data were D=0%, I=89% ,C=11% at 65cm and D=2% ,I=98% ,C=0% at 80cm. Subjects with Add≥1.75D should theoretically be forced to use the corridor for tasks between 65-80cm. Experimental results were: D=0%, I=94%, C=6% at 65cm and D=0%, I=100%, C=0% at 80cm Theoretical predictions and measurements agreed up to 99.1%. Differences in reading behavior were found depending on letter size and vertical position of the text; for example, the PPL near regions were only used with the lower-positioned laptop screen.

Conclusions : The experiment suggests that PPL wearers indeed use the distance and near regions of their lenses for reading on computer screens, depending on their AA and prescribed addition, as theoretically predicted.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.

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