DISTRIBUTION OF THE PHOTOPIC AND MESOPIC PUPIL DIAMETER, CHORD , CHORD  AND THE B/F RATIO IN HEALTHY PATIENT EYES

The aim of this retrospective study is to investigate the distribution of different parameters of the anterior segment in healthy eyes.

Department of Ophthalmology at the Heidelberg University Hospital, Germany; I.R.C.C.S.-G.B. Bietti Foundation, Rome, Italy; QVision Vithas Hospital Almería, Almería, Spain

In this retrospective study 1086 phakic eyes without any known pathology or refractive surgery were measured with the Pentacam AXL Wave. Only measurements with good quality were analyzed. Photopic and mesopic pupil diameter, Chord μ, Chord α and the B/F ratio were analyzed. Mean values and standard deviations (SD) were calculated and all parameters were analyzed for correlation with age, spherical equivalent (SEQ) and gender. Simple correlation analysis was performed using Pearson correlation coefficient and linear regression model was assumed. T-test was used to detect statistically significant differences between male (m) and female (f).

1086 eyes were measured. The mean age (± SD) of the patients was 53.03 (±19.44) years. Mean SEQ was -1.79 (±3.75)D. There was no statistically significant difference between the mean SEQ of both genders but a weak correlation between SEQ and age (R=0.3).

Photopic pupil diameter was 2.76 (±0.64)mm with a statistically significant difference between m and f (p=7e-04) and a weak negative correlation with age (R=-0.29)but no correlation with SEQ (R=0.01, p>0.05).

On the other hand mesopic pupil diameter showed a strong negative correlation with age (R=-0.51, p<0.001), a weak negative correlation with SEQ (R=-0.1) and a statistically significant difference between m and f (p< 0.05)with a mean value of 5.06 (±1.19)mm.

Chord μ had a mean vector of 0.23 (± 0.13)mm with no statistically significant difference between m and f (p>0.05) and a weak correlation with age (R=0.16) and SEQ (R=0.28).

Chord α had a mean vector of 0.44 (±0.16)mm with no statistically significant difference between f an m (p>0.05) and a weak correlation with age (R=0.12), but a moderate correlation with SEQ (R=0.33).

B/F ratio had a mean value of 81.95 (±1.61)% and showed no statistically significant difference between f and m. There was no correlation with age but a weak negative correlation with SEQ (R=-0.14).

This data implements normative patient data for important anatomical parameters and their correlation with gender, SEQ and age of the anterior eye segment measured with the Scheimpflug-device Pentacam AXL Wave.