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Study shows contrast sensitivity testing with iPad-based test is rapid, convenient
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SEATTLE – In a study reported here at the American Academy of Optometry annual meeting, the iPad Letter Contrast Sensitivity Test showed similar repeatability in both normally sighted and low vision patients, according to author Mark A. Bullimore, McOptom, PhD.
Bullimore told attendees at an academy-sponsored press conference that he and his colleagues looked at 40 subjects: 20 with normal vision and 20 with low vision/reduced contrast sensitivity.
The subjects were tested monocularly for contrast sensitivity at 1 meter while wearing their habitual correction. Researchers evaluated results with the Pelli-Robson Chart, Freiburg Acuity and Contrast Test, and Ridgevue Vision Contrast Sensitivity Test for the iPad.
According to the study abstract, the three tests showed good repeatability in terms of the 95% limits of agreement. The Ridgevue test showed good agreement with the Freiburg test in by-letter scoring and 95% limits of agreement, but the Pelli-Robson test had significantly lower values. Patients with low vision had slightly poorer repeatability.
“Agreement between the iPad and Freiburg tests was good, but the Pelli-Robson test gave significantly lower values,” the abstract read.
“The iPad test is a rapid and convenient alternative to existing tests,” Bullimore said at the press conference. “You don’t have to buy a separate light box or printed chart; just download it from the iTunes store.”
Disclosure: Bullimore has no relevant financial interests to disclose.