Purchase this article with an account.
Galton Carvalho Vasconcelos, Adriana Berezovsky, Nivea Nunes Cavascan, Paula Sacai, Arthur Gustavo Fernandes, Marcela Cypel, Sung Watanabe, Marcos Jacob Cohen, Cristina Coimbra Cunha, Joao M Furtado, Jacob Moyses Cohen, Rubens Belfort, Sergio Munoz, Solange Rios Salomao; Vision Status and Impact of Refractive Correction on Distance Visual Acuity in Older Adults from Parintins City: The Brazilian Amazon Region Eye Survey. Invest. Ophthalmol. Vis. Sci. 2017;58(8):2383.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
To determine the vision status and the impact of refractive correction on distance visual acuity in a population of older adults from the Brazilian Amazon Region.
A population-based cross sectional study was conducted using cluster random sampling to enumerate subjects ≥45 years of age. Eligible subjects were enumerated through a door-to-door household survey and invited for visual acuity (VA) testing and an eye exam. Uncorrected (UCVA) and presenting (PVA) distance visual acuity were measured from each eye using a logMAR chart. Auto-refraction followed by subjective refraction was carried out to determine the best-corrected visual acuity (BCVA). Vision status was defined by lines of visual impairment considering UCVA and PVA. The impact of refractive correction was defined as lines of improvement from UCVA to BCVA and from PVA to BCVA. The association of two or more lines of improvement with causes of vision impairment (refractive or other) and socio-demographic variables were assessed by multiple logistic regression.
A total of 2384 eligible persons was enumerated, and 2041 (85.7%) were examined. Out of these, 2025 individuals who informed VA (4050 eyes) were included. Lines of impairment ranged from 0 (20/20) in 621 (15.3%) eyes to >10 lines (<20/200) in 332 (8.2%) eyes, with an average of 4.4±0.06 lines for UCVA. For PVA lines of impairment ranged from 0 in 904 (22.3%) eyes to > 10 lines in 317 (7.8%) eyes, with an average of 3.8±0.07 lines. Average UCVA to BCVA improvement was 2.2±0.03 lines, ranging from 0 (no improvement) in 1173 (29.0%) eyes to ≥ 10 lines in 16 (0.4%) eyes; with 2083 (51.4%) eyes improving ≥ 2 lines. For PVA to BCVA improvement the average was 1.6±0.03 lines, ranging from 0 in 1590 (39.3%) eyes to ≥ 10 lines in 2 (0.05%) eyes, with 1559 (38.5%) eyes improving ≥ 2 lines. Two or more lines of improvement from UCVA to BCVA was associated with refractive error, younger age and rural area. Similar results for improvement from PVA to BCVA were found for refractive error, younger age and male gender.
A small proportion of participants presented no distance visual acuity impairment per eye, both for uncorrected and presenting visual acuity. Therefore, refractive correction should be available, especially for those at a younger age and living in rural areas.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
This PDF is available to Subscribers Only