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Stefanie Drew, Amy Escobar, Chunming Liu, Efrain Castellanos, Lawrence Stark, Eric Borsting, Chris Chase; Can chronic visual symptoms measures accurately predict acute visual discomfort symptoms?. Invest. Ophthalmol. Vis. Sci. 2013;54(15):5326.
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Most surveys of discomfort symptoms are retrospective and assess the frequency and severity of chronic conditions. To our knowledge, there are no studies that have shown chronic symptom surveys can predict acute symptoms. We investigated the relationship between chronic visual discomfort and ratings of acute discomfort symptoms after tests of accommodation and vergence.
Prior to testing accommodation and vergence function, the Conlon visual discomfort survey (Conlon et al., Vis Cogn 1999;6:637-666) assessed chronic visual discomfort symptoms in 38 graduate students. This survey consists of 23 items that address one of five symptom categories (text movement, headache and soreness, blur, reading problems and glare). Acute symptoms were measured with four questions using a five-point rating scale i) discomfort experienced, ii) amount of distortions or movement, iii) discomfort from overhead lights and iv) amount of headache experienced. Binocular function was tested using standard clinical procedures. After a control accommodation facility test using ± 0.12D lens, baseline acute visual discomfort was 5.05 (1.11). A second acute symptom test was made after the binocular exam, producing an average score of 7.63 (3.35). Individuals were classified into High (N=16) or Low (N=22) acute symptom groups with a post-exam cut-off score ≥ 7. A logistic regression analysis was performed with the symptom group as a dependent variable and scores from the Conlon question categories as the independent variables to determine how well the chronic symptom survey predicts acute symptom grouping.
A full model significantly predicted post-exam classification (High or Low) (omnibus chi square = 13.039, df = 5, p = 0.023). This model accounts for between 29.7% and 40.1% of the variance in post-exam performance, with 81.8% of the Low post-exam symptoms correctly predicted and 66.7% of High post-exam symptoms predicted. Overall, 75.7% of predictions were accurate. Examination of the predictor variables revealed that only headache questions reliably predict post-exam symptom group (B = .381, df = 1, p = 0.018).
These data suggest that a chronic symptom survey can make reasonably good predictions about acute symptoms associated with tests of accommodation and vergence and that questions assessing headache and soreness symptoms are the best correlate.
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