Anterior segment changes after femtosecond cataract surgery measured with optical coherence tomography and scheimpflug imaging technology
Abstract
Purpose
To determine changes in anterior chamber depth (ACD), iridocorneal angle size (IAS) and central corneal thickness (CCT) using optical coherence tomography (OCT) and Scheimpflug imaging technology (SIT) in subjects implanted with multifocal intraocular lens (IOL) after femtosecond cataract surgery.
Methods
Prospective study of 36 healthy eyes (68.8 ± 7.9 years) undergoing femtosecond laser assisted-cataract surgery and AcrySof REsTOR SN6AD1 IOL implantation. The anterior segment parameters were measured preoperatively and 1 month after surgery with the Visante-OCT (Zeiss) and the Oculyzer™ II (WaveLight® AG) systems. Analysis of agreement and interchangeability of the preoperative 2 systems measurements was performed by the Bland-Altman method.
Results
After femtosecond cataract surgery, the ACD and IAS measured with Oculyzer™ II showed a significant mean increase of 1.54 ± 0.28 mm and 10.2 ± 4.23 respectively. Also, using the Visante-OCT there was a significant mean increase: 1.27 ± 0.34 mm for ACD and 9.38 ± 6.52 (Temporal) and 8.29 ± 7.13 (nasal) for IAS. CCT showed no significant changes. The range of agreement indicated that the 2 techniques cannot be used interchangeably for preoperative measurement of ACD and IAS.
Conclusions
After cataract surgery with femtosecond laser, ACD and IAS increased significantly when measured using OCT and SIT. Visante-OCT and Oculyzer™ II systems can be used interchangeably for CCT evaluation but not for ACD and IAS.
