Is a reading addition necessary for clinical contrast sensitivity measurements?

Latham, Keziah and Hughes, Julie A. (2013) Is a reading addition necessary for clinical contrast sensitivity measurements? In: European Academy of Optometry and Optics (EAOO), Malaga, Spain.

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Purpose: Clinical tests of contrast sensitivity are performed at near with letters large enough to be above the acuity threshold of presbyopes with normal vision. Is a reading addition necessary to obtain accurate thresholds? Method: Contrast sensitivity was assessed using Pelli-Robson and Mars charts. Participants were presbyopes with normal or corrected-to-normal distance and near acuity. Contrast sensitivity was assessed with participants wearing distance refractive correction, and also wearing an appropriate addition for the working distance (+0.75DS for the Pelli-Robson at 1m; +2.00DS for the Mars at 50cm). Results: The difference between contrast sensitivity measurements made with and without the reading addition was not signifi cant for either chart (repeated measures t-test, p>0.05 for Pelli-Robson and Mars). Conclusion: Contrast sensitivity can be assessed in presbyopic visual normals with patients wearing either distance or near correction without affecting thresholds.

Item Type: Conference or Workshop Item (Poster)
Faculty: ARCHIVED Faculty of Science & Technology (until September 2018)
Depositing User: Repository Admin
Date Deposited: 08 Jul 2013 10:36
Last Modified: 09 Sep 2021 19:02

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