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ABSTRACT
Standardizing illumination conditions is crucial for ensuring the meaningful comparison of measurements taken by different clinicians (Richard et al., 1973). This requirement is underscored by the significance of promoting consistency, particularly within the context of successful public health programs. Autorefractors offer an objective means of determining refractive errors. It is well-established that illumination levels influence both pupil size and accommodation, factors with direct implications for refractive error measurement. This study sought to explore potential disparities in objective refraction under conditions of bright and dim illumination. 60 subjects, ranging in age from 15 to 55 years, underwent assessment within a range of illuminance levels spanning from 50 to 550 lux, as meticulously measured by a Lixaus LX- 1010B digital lux light meter. The refractive power of their eyes was ascertained using an autorefractor, first in dim illumination and subsequently in bright lighting conditions, enabling a comparative analysis. The findings of this study conclusively demonstrate that changes in illuminance levels do not exert any statistically significant influence on the reliability of autorefraction measurements. Moreover, alterations in pupil size were found to have no discernible impact on the accuracy of autorefraction readings. In essence, this research provides valuable insights into the imperative of standardizing illumination conditions to enhance the precision of refractive error measurement. It also reinforces the notion that clinicians can confidently rely on the dependability of autorefractors when making informed decisions concerning vision correction.
