Artikel
Pupillometric screening of a refractive patient cohort
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Autoren
Veröffentlicht: | 22. September 2004 |
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Gliederung
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Objective
This study aimed to identify the distribution of pupil sizes in a group of refractive patients. In addition it aimed to examine if the corneal topography system Orbscan II is suitable for screening of mesoptic pupil sizes in refractive patients.
Methods
In 112 eyes of 61 patients (median age 34yrs., 95% CI 20 to 57yrs.) pupil size was measured with the Procyon pupillometer and, under photopic conditions, with the Orbscan II corneal topography system (Bausch & Lomb).
Results
The pupil sizes measured with the Procyon pupillometer were under scotopic conditions in the median 6.2mm (95% CI 6.1 to 6.3), under "mesopic-low" conditions 5.7mm (95% CI 3.7 to 7.4mm), and under "mesopic-high" conditions 4.1mm (3.8 to 4.3mm). Pupil sizes measured with Orbscan II were in the median 4.0mm (95% CI 2.8 to 5.6mm). Pupil sizes measured with Orbscan II correlated well with "mesopic-low" pupil sizes measured by Procyon (r=0.77). If Orbscan II pupil size was smaller than 4.5mm, "mesopic-low" Procyon pupil size was always below 7mm. If Orbscan pupil size was greater than or equal to 4.5mm, the probability for a Procyon pupil size to be more than 7mm was 36% (9 out of 25; difference signif. in Chi2 test, p<0,0001).
Conclusions
Mesopic-low Procyon pupil sizes were in the median 5.7mm. Thus they were as expected much higher than the photopic Orbscan II pupil sizes of 4.0mm. Between the two methods, pupil sizes correlated well, however, rendering Orbscan II valuable for refractive screening. If, in refractive screening, Orbscan II shows a pupil size of less than 4.5mm, our cohort never showed a pupil size of more than 7mm under mesopic conditions.