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C. Erb, J. Stapel, H. Marius, M. Meyer, A. Schröder; Acquired Color Vision Disturbances in Patients With Primary Pulmonary Hypertension . Invest. Ophthalmol. Vis. Sci. 2005;46(13):4575.
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Purpose: In view of the generally impaired vascular condition in patients with primary pulmonary hypertension (PPH), we were interested in their colour perception. Methods: The ophthalmological examination includes morphological status, visual acuity, refraction, intraocular pressure, and the cup/disk–ratio. Colour vision, examined by both, the pseudoisochromatic plates of Ishihara and the cap–sorting test, Roth 28–hue (E) desaturated, were measured monoculary under standard conditions in both eyes. The background was a black cardboard; illumination was provided by fluorescent light sources (2000 lux, 5500 Kelvin) with a balanced spectral distribution and a colour–rendering index of 93 (Osram L36W/12 LDL Daylight). Results: Seventeen patients (m:f=2:15; mean age 52+10.8 years) with PPH and 17 generally healthy controls (m:f=7:10; mean age 53.2±7.5years) were examined. Visual acuity, refraction, intraocular pressure and the cup/disk–ratio of the patients as well as the readings with the Ishihara plates were within normal ranges. But testing of colour vision with the Roth 28–hue (E) desaturated revealed a significantly higher error score in patients with PPH (194.2±79.1) than the control group (91.1±64.1; p<0.001). A particular colour axis (blue–yellow or red–green) was not found. Conclusions: Although patients with primary pulmonary hypertension appeared ophthalmologically healthy under routine eye examination, colour vision was considerable disturbed. This could be an functionally early sign of disturbances in choroidal microcirculation.
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