Mesopic Pelli-Robson contrast sensitivity and MP-1 microperimetry in healthy ageing and age-related macular degeneration

Maynard, Michelle L., Zele, Andrew J., & Feigl, Beatrix (2016) Mesopic Pelli-Robson contrast sensitivity and MP-1 microperimetry in healthy ageing and age-related macular degeneration. Acta Ophthalmologica. (In Press)

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Abstract

Purpose

  • To determine whether decreasing illumination of the Pelli-Robson contrast sensitivity (CS) chart and MP-1 microperimeter to low mesopic conditions is more sensitive to vision changes occurring with healthy ageing and in early and intermediate age-related macular degeneration (AMD) and whether these mesopic tests can differentiate visual function between healthy older participants with and without AMD risk genotypes.

Methods

  • Retinal sensitivity was measured in 98 healthy participants (19-85 years) and 21 AMD (AREDS Grade 2/3) patients (73.9±6.5 years) using the Pelli-Robson CS chart and MP-1 microperimeter under low mesopic and standard illumination. The effect of ageing and AMD on retinal sensitivity was estimated using regression analysis. Healthy older participants (>50 years; n=24) were genotyped for AMD risk genes CFH and/or ARMS2 and retinal sensitivity was compared between genotypes.

Results

  • With healthy ageing, photopic and mesopic Pelli-Robson CS showed a similar decline (-0.004 log CS/year). In AMD, photopic CS showed a similar decline to healthy ageing (-0.004 log CS/year) while mesopic CS was significantly reduced (-0.007 log CS/year). Both standard and low mesopic microperimetry showed a significant decline (-0.51 and -0.73 % contrast/year) with healthy ageing and greater decline (-0.73 and -0.99 % contrast/year) with AMD onset. Pelli-Robson CS and microperimetry sensitivity did not differ between AMD risk genotypes.

Conclusions

  • Mesopic Pelli-Robson CS detects functional deficits before photopic CS in early and intermediate AMD that can be differentiated from normal ageing. This test can be easily administered in clinical practice and may provide a means for early detection of retinal dysfunction.

Impact and interest:

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ID Code: 97854
Item Type: Journal Article
Refereed: Yes
Keywords: contrast sensitivity, macular degeneration, mesopic, microperimetry
DOI: 10.1111/aos.13112
ISSN: 1755-3768
Divisions: Current > Schools > School of Biomedical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Funding:
Copyright Owner: 2016 Acta Ophthalmologica Scandinavica Foundation
Deposited On: 02 Aug 2016 22:34
Last Modified: 07 Aug 2016 06:11

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