Table 1.
Geometrical characteristics of eyes as measured by the ESP system.
Fig 1.
(a) An eye image taken by the ESP digital camera; (b) Frequency of different light intensity values where the first peak corresponds to pupil’s colour, the second peak corresponds to the iris’s colour and the last peak corresponds to the sclera’s colour.
Fig 2.
Detected limbus (black contour).
(a) Second derivative of the anterior eye surface height data; (b) Anterior eye surface constructed by height data as measured by the Eye Surface Profiler.
Fig 3.
Both eyes of a 37 years old female participant.
Location of the mean 3D limbus contour (black dots) fitted to 3D plane (transparent black) for right and left eyes. N, T, S, I stand for nasal, temporal, superior and inferior sides respectively. For displaying purposes, the digital image of the eye is projected onto the eye surface and the 3D limbus contour is projected onto the eye image.
Table 2.
Limbus to limbus edges, white-to-white edges and 3D limbus sagittal depth.
Fig 4.
Mean difference (δ) between the limbus contours and the white-to-white contours for right and left eyes. N, T, S & I stand for nasal, temporal, superior and inferior sides respectively. The red line is the angle at which the limbus contour recorded the maximum diversion from the white-to-white contour, while the green line is the angle of the minimum diversion.
Fig 5.
Location of the mean 3D limbus contour (black line) surrounded by standard deviation (STD) as a 3D tube and the mean white-to-white contour for right and left eyes.
N, T, S & I stand for nasal, temporal, superior and inferior sides respectively. The red plane is the 3D limbus best fit plane and the green plane is the same plane after being levelled to be normal to the Z-axis. The origin of each plot is marked by a black cross which represent the position of the average corneal apex.