Refractive error study in young subjects: results from a rural area in Paraguay



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Signes Soler, Isabel and Hernández Verdejo, José Luis and Estrella Lumbreras, Miguel Ángel and Tomás Verduras, Elena and Piñero, David Pablo (2017) Refractive error study in young subjects: results from a rural area in Paraguay. International journal of ophthalmology, 10 (3). pp. 467-472. ISSN 2222-3959

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AIM: To evaluate the distribution of refractive error in young subjects in a rural area of Paraguay in the context of an international cooperation campaign for the prevention of blindness.
METHODS: A sample of 1466 young subjects (ranging from 3 to 22 years old), with a mean age of 11.21±3.63 years old, were examined to assess their distance visual acuity (VA) and refractive error. The first screening examination performed by trained volunteers, included visual acuity testing, autokeratometry and non-cycloplegic autorefraction. Inclusion criteria for a second complete cycloplegic eye examination by an optometrist were VA <20/25 (0.10 logMAR or 0.8 decimal) and/or corneal astigmatism ≥1.50 D.
RESULTS: An uncorrected distance VA of 0 logMAR (1.0 decimal) was found in 89.2% of children. VA <20/25 and/or corneal astigmatism ≥1.50 D was found in 3.9% of children (n=57), with a prevalence of hyperopia of 5.2% (0.2% of the total) in this specific group. Furthermore, myopia (spherical equivalent ≤-0.5 D) was found in 37.7% of the refracted children (0.5% of the total). The prevalence of refractive astigmatism (cylinder ≤-1.50 D) was 15.8% (0.6% of the total). Visual impairment (VI) (0.05≤VA≤0.3) was found in 12/114 (0.4%) of the refracted eyes. Main causes for VI were refractive error (58%), retinal problems (17%, 2/12), albinism (17%, 2/12) and unknown (8%, 1/12).
CONCLUSION: A low prevalence of refractive error has been found in this rural area of Paraguay, with higher prevalence of myopia than of hyperopia.

Item Type:Article
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Received:January 18, 2016 Revised:April 28, 2016

Uncontrolled Keywords:Blindness; Hyperopia; Myopia; Refractive error; Visual impairment
Subjects:Medical sciences > Optics > Low vision
Medical sciences > Optics > Optometry
ID Code:44548
Deposited On:11 Sep 2017 13:15
Last Modified:11 Sep 2017 13:15

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