People suffering from Chronic Fatigue Syndrome (CFS) could experience higher levels of visual stress than those without the condition, according to new research.
Diagnosis of ME/CFS is controversial. With the exception of disabling fatigue, there are few definitive clinical features of the condition and its core symptoms, overlap with those often prevalent in other conditions. As a result, ME/CFS is often a diagnosis of exclusion, being made as a last resort and possibly after a patient has experienced a series of inappropriate treatments of misdiagnosed disorders.
Researchers examined patients with and without CFS and has found that those suffering from the condition are more vulnerable to pattern-related visual stress, which causes discomfort and exhaustion when viewing repetitive striped patterns, such as when reading text.
The results of the study, which is published in the journal Perception, could help in the diagnosis of CFS, as the findings suggest that there are visual system abnormalities in people with ME/CFS that may represent an identifiable and easily measurable behavioral marker of the condition.
The study assessed vulnerability of ME/CFS patients to pattern-related visual stress using a standardized test called the pattern glare test, in which people report the number of visual distortions they experience when looking at three repetitive striped patterns of different levels of detail. During the study twenty patients with CFS and twenty patients without the condition were recruited.
Participants viewed 3 patterns, the spatial frequencies (SF) of which were either 0.3 (low-SF), 2.3 (mid-SF) and 9.4 (high-SF) cycles per degree (c/deg). They then reported the number of distortions they experienced when viewing each pattern.
Patients with ME/CFS reported more distortions on the intermediate striped pattern (Pattern 2) than people without the condition.
http://pec.sagepub.com/content/44/12/1422.abstract
Edited
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