July 2019
Volume 60, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2019
Repeatability of Contrast Sensitivity in Patients with Infantile Nystagmus Syndrome Using the CSV-1000R
Author Affiliations & Notes
  • ABIGAIL R. KRAFT
    Ophthalmology, Akron Children's Hospital, Akron, Ohio, United States
  • Alyssa M Gehring
    Ophthalmology, Akron Children's Hospital, Akron, Ohio, United States
  • Richard W Hertle
    Ophthalmology, Akron Children's Hospital, Akron, Ohio, United States
  • Tawna L Roberts
    Byers Eye Institute, Stanford University, Palo Alto, California, United States
  • Footnotes
    Commercial Relationships   ABIGAIL KRAFT, None; Alyssa Gehring, None; Richard Hertle, None; Tawna Roberts, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2019, Vol.60, 532. doi:https://doi.org/
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      ABIGAIL R. KRAFT, Alyssa M Gehring, Richard W Hertle, Tawna L Roberts; Repeatability of Contrast Sensitivity in Patients with Infantile Nystagmus Syndrome Using the CSV-1000R. Invest. Ophthalmol. Vis. Sci. 2019;60(9):532. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : To assess the test-retest reliability of contrast sensitivity in patients with Infantile Nystagmus Syndrome (INS).

Methods : Test-retest contrast sensitivity (CS) was measured binocularly in 20 INS patients (17.8 years; 8-64) and 20 age-matched visually normal control subjects (19.6 years, range 8-62) using the CSV-1000R. CS was evaluated at four spatial frequencies (3, 6, 12, and 18 cycles per degree [cpd]). Each spatial frequency had 8 contrast levels with an average inter-stimulus decrease of 0.15 log units. Spatial frequencies were displayed in 2 rows with the test pattern in the top or bottom row (2 alternative forced choice). All levels were presented to each subject. Contrast threshold was defined as the level immediately prior to the first misidentified pattern. Test-retest reliability was assessed using Bland-Altman plots and the 95% limits of agreement (LOA) and intraclass correlation coefficients (ICC).

Results : The absolute difference in test-retest in CS scores for each spatial frequency (3, 6, 12, 18 cpd) was 0.2±0.2, 0.3±0.3, 0.3±0.3, and 0.1±0.2 log units for INS subjects and 0.1±0.1, 0.1±0.2, 0.2±0.3, and 0.1±0.3, log units for control subjects, respectively. INS subjects had a greater absolute difference in test-retest than controls at 3 cpd (p=0.047). The upper and lower limits of the 95% LOA for each spatial frequency were greater in INS subjects for 3 [INS: -0.40, 0.56; CS: -0.28, -0.35], 6 (INS: -0.90, 0.80; CS: -0.31, 0.46), and 12 (INS: -0.78, 0.83; CS: -0.55, 0.66) cpd. Control subjects had slightly greater 95% LOAs at 18 cpd (INS: -0.41, 0.53; CS: -0.44, 0.59). ICCs were moderate at 3 (0.66) and 6 (0.68) cpd, and high at 12 (0.79) and 18 (0.86) cpd.

Conclusions : INS subjects had a significantly greater absolute difference in contrast sensitivity test-retest compared to control subjects at 3 cpd. Despite having moderate to high reliability measures using ICC, the 95% LOA was ≥0.94 log units for INS patients and ≥0.63 log units for control subjects, which equates to approximately 6 and 4 levels on the chart, respectively. Our results suggest that despite INS patients and control subjects having similar test-retest reliability, CS testing using the commercially available CSV-1000R has larger 95% LOA than desired as a measure of CS in a potential clinical trial.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.

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