Anatomic topographic features of pseudophakic eyes after cataract phacoemulsification with intraocular lens implantation by means ultrasound biomicroscopy

Purpose
To determine anatomic topographic features of pseudophakic eyes after cataract phacoemulsification with intraocular lens implantation by means ultrasound biomicroscopy (UBM),
Material and methods: 93 patients (99 eyes) with different types of clinical refractions have been selected for this investigation. The average age was 71.2 years (55-83). The axial length was 21.62±0,67 mm in patients with hyperopic refraction, 23.54±0,40 mm — in patients with emmetropic refraction and 25.86±1,21 mm - in cases of myopic refraction. UBM «SONOMED» (USA) examinations were performed and following parameters were measured: anterior chamber depth (ACD), trabecula-iris distance (TID), trabecula-cilliary processes distance (TCPD), iris-cilliary processes distance (ICPD), iris-IOL distance.
Results: The depth of anterior chamber was deeper in pseudophakic eyes and its depth depended on initial clinical refraction. This increase was 1.8 times in hyperopic refraction, 1.6 times in emmetropia and 1.45 times in myopia. It was appearance of a 0.04-0.06mm space between iris and IOL in the centre of anterior chamber. The increase of trabecula-iris distance has reflected the widening of anterior-chamber angle. In some cases its widening was 10 and more times in hyperopic eyes, 1.6 times - in emmetropic eyes and 1.4 times- in myopic eyes. The changes of trabecula-cilliary body distance ( from 0.87mm to 1.04mm) and iris-cilliary body distance (0.04-0.08mm) were only in hyperopic eyes and it indicated the decrease of anterior cilliary body rotation.
Conclusion: The revealed features of the anatomic topographic relationships of eyes structures indicated a widening of functional space for structures of iridocilliary zone after uncomplicated cataract phacoemulsification. These changes are more intensive in hyperopic eyes.