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Yi Sun, Elif Erdem, Andrew Lyu, Camila Zangalli, Sheryl S Wizov, Dave Lo, Eric Spaeth, Jesse Richman, George L Spaeth; SPARCS: A novel assessment of contrast sensitivity and its validity in patients with refractive error. Invest. Ophthalmol. Vis. Sci. 2014;55(13):2711.
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© ARVO (1962-2015); The Authors (2016-present)
To explore the reliability and vadility of Spaeth Richman contrast sensitivity(SPARCS) test; to assess the contrast sensitivity distribution among various refractive errors.
93 individuals (182 eyes) with varying amounts of refractive errors were included in this study, divided into six groups according to their spherical equivalent. Contrast sensitivities were assessed using Pelli-Robson chart(PRC) and SPRACS instrument. Each eye was tested twice for each measurement. Outcomes including the correlation of PRC and SPARCS scores and the test-retest agreement of the two measurements were analyzed; the distribution of contrast sensitivity among the six groups was compared.
Pearson correlation analysis showed a statistically significant correlation between SPARCS scores and PRC scores(P<0.01). Reliability analysis showed SPARCS had better test-retest agreement than PRC, with SPARCS exhibiting a higher intraclass coefficient(ICC=0.635). There were no significant differences in contrast sensitivity scores among the six refractive groups, for both measurements.
SPARCS seems to be an accessible, easy-to-perform, reliable and valid internet-based assessment for contrast sensitivity. The difference in contrast sensitivity among myopes, emmetropes, hyperopes was insignificant.
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