Does severity of dermatochalasis in aging affect corneal biomechanical properties?

PURPOSE: The aim of this study was to investigate the possibility of a relationship between corneal biomechanical properties and different grades of dermatochalasis. PATIENTS AND METHODS: Patients were assigned to four groups according to the severity of their dermatochalasis: normal (Group 1), mild (Group 2), moderate (Group 3), and severe (Group 4). An Ocular Response Analyzer device was used to measure corneal hysteresis (CH), corneal resistance factor (CRF), and corneal-compensated intraocular pressure (IOP(cc)). RESULTS: We found no significant differences in the mean values of the CH, CRF, and IOP(cc) of all groups (P=0.75, P=0.93, and P=0.11, respectively). However, CH and IOP(cc) were negatively correlated in Group 1, Group 2, and Group 3 patients (P=0.013, r=−0.49; P=0.015, r=−0.52; and P=0.011, r=−0.47, respectively), but this correlation was not apparent in the Group 4 patients (P=0.57, r=0.12). CRF and IOP(cc) were correlated, but only in Group 4 (P=0.001, r=0.66). CONCLUSION: Severe dermatochalasis was associated with altered corneal biomechanical properties. Some of the important visual consequences of dermatochalasis and related diseases (such as floppy eyelid syndrome) can be understood by considering corneal biomechanical alterations.