Wednesday, December 12, 2012

Abstract: Dry eye slows down your reading

Gosh, couldn'ta guessed that one ;-)

Visual disturbance is a common symptom reported by patients with dry eye disease (DED). The purpose of this study was to evaluate visual performance, including reading speed and contrast sensitivity, in control and DED subjects.
 Fifty-two DED patients (mild, n = 17; moderate, n = 22; severe, n = 13; based on corneal staining and the Ocular Surface Disease Index ≥20) and 20 control subjects (Ocular Surface Disease Index <13 18="18" 19="19" 45="45" 84="84" adjusting="adjusting" age="age" among="among" analysis="analysis" and="and" automated="automated" between="between" br="br" characteristics="characteristics" clinical="clinical" coefficients="coefficients" compare="compare" conducted="conducted" contrast="contrast" control="control" corneal="corneal" correlation="correlation" covariance="covariance" ded="ded" determined="determined" for="for" from="from" groups="groups" holladay="holladay" in="in" linear="linear" measure="measure" measured="measured" no="no" of="of" parameters.="parameters." part="part" partial="partial" patients="patients" ranges="ranges" rate="rate" reading="reading" regression="regression" relationship="relationship" respectively.="respectively." sensitivity="sensitivity" sex="sex" site.="site." speed="speed" staining="staining" study.="study." study="study" subject="subject" system="system" test.="test." the="the" this="this" to="to" took="took" used="used" using="using" was="was" were="were" while="while" wilkins="wilkins" with="with" years="years"> RESULTS:
The log of the minimum angle of resolution visual acuities and contrast sensitivity were not significantly different across subject groups. The DED patients (134.9 ± 4.95 words per minute) exhibited slower reading speeds than the control subjects (158.3 ± 8.40 words per minute, p = 0.046). As DED severity increased, the reading speed decreased (141.0 ± 7.96 words per minute, 136.8 ± 7.15 words per minute, and 127.0 ± 9.63 words per minute in mild, moderate, and severe groups, respectively). Reading rate was found to correlate weakly with corneal staining based on a partial correlation coefficient (-0.345, p < 0.001) but not with other DED parameters.
The reading rate was lower in DED subjects than that in control subjects. As the DED severity increased, the reading rate decreased. This finding is consistent with patient-reported symptoms and provides direct evidence for the impact of DED on reading performance. These findings suggest that reading speed may be used to monitor treatment benefit in DED.

Optom Vis Sci. 2012 Dec 4. [Epub ahead of print]
Ridder WH 3rd, Zhang Y, Huang JF.
*OD, PhD, FAAO †PhD Southern California College of Optometry, Fullerton (WHR); and Pfizer, Inc., La Jolla (YZ, J-FH), California.

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