Blanco-Garavito R, Macías-Rodríguez Y, Villarreal-Muraira AL

Language: Spanish
References: 8
Page: 376-380
PDF size: 40.45 Kb.

ABSTRACT

Background: Nocturnal myopia is described in the functional range of -0.75 D (38% of the population) up to -2.50 D (4%). Those who drive vehicles in mesopic conditions have more symptoms, even though there is some lighting in metropolitan highways.
Objective: To analyze the quality of vision reported by emmetropic patients when corrected with 0.50 and 1.00 D minus lenses and to relate these results to their accommodation range and the induced miosis.
Methods: 20 individuals, with an average age of 42.5 years (18 to 62), whose visual acuity was 20/20 without correction, were studied. In mesopic conditions, the pupillary response was measured with the individuals maximal accommodative amplitude, and with the use of 1.00 and 0.50 D minus lenses. These results were compared with their reported visual experience when driving, which was analyzed with a questionnaire adapted from the validated Visual Function Questionnaire- 25 (NEI).
Results: 80% of the subjects reported a better nocturnal visual experience with the use of myopic correction with -0.50 D, independent of their accommodation amplitude or of the induced miosis with negative lenses. The visual experience was worse with -1.00 D.
Conclusions: The use of –0.50 D spectacles produces a better visual experience in mesopic conditions. Neither miosis nor accommodative amplitude played an important part in the bettering of the visual experience.

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