Dr.APOORVA N, A21392
Purpose: To compare the changes in corneal biomechanical parameters between PRK and SMILE using scheimpflug based non-contact tonometer
Materials and Methods: Retrospective analysis of 60 eyes who underwent PRK(n=30) and SMILE(n=30) was performed. The two groups were matched in terms of age, SE, CCT and Biomechanically corrected IOP. CORVIS-ST parameters such as Deformation amplitude(DA), Applanation length 1&2(A1&A2), Maximum concavity radius(MCR), Corvis biomechanical index(CBI) and Total biomechanical index(TBI) were measured pre and 1 month post surgery in both groups
Results: Compared to pre, the PRK group showed a significant reduction in A1,A2 and CBI post 1 month while the SMILE group showed only in CBI values(P value <0.05). However both the groups showed comparable values in DA, A1, A2, MCR, CBI and TBI at one month post surgery(P value >0.05)
Conclusion:Both the procedures caused reduction in corneal biomechanics, however PRK affected CORVIS-ST parameters to a larger extent
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