Abstract
Purpose :
To evaluate morphological changes of ciliary body during accommodation using anterior segment OCT and UBM devices.
Methods :
12 phakic and 8 pseudophakic eyes were enrolled in the study: measurements were executed in sitting position both staring into the infinity and to a point 20 cms far (non accommodative and accommodative settings). Images were analysed using an image processor software. During the analysis of both OCT and horizontal UBM images scleral spur was the zero point. At points 1 and 2 mms far from the scleral spur (CMT1 and CMT2) the ciliary body thickness were measured.
Results :
There was a statistically significant change regarding ciliary body thickness during accommodation in case of phakic patients at the distance of 2 mm that proved to be slightly larger by using OCT device (OCT non accomodative: CMT1: 0.63±0.12 mm, CMT2: 0.4±0.10 mm, OCT accomodative: CMT1: 0.65±0.15 mm, CMT2: 0.36±0.11 mm, pCMT1 = 0.42, pCMT2 < 0.001; UBM non accomodative: CMT1: 1.02±0.27 mm, CMT2: 0.54±0.16 mm, UBM accomodative: CMT1: 0.96±0.24 mm, CMT2: 0.48±0.13 mm, pCMT1 = 0.36 , pCMT2 = 0.04). This significant difference could not be seen in case of pseudophakic eyes neither by using UBM nor OCT device. It was much easier to identify its borders using the anterior segment OCT device, but the area of fibrae meridionales remained hidden. Using UBM device - even if the borders were not sharp - both parts of the ciliary muscles were visible and measurable.
Conclusions :
Morphological change of the ciliary body during accommodation were proved using both devices. While the OCT is able to produce sharper images, only the UBM is able to visualize this whole area.
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.