In the study, The Investigators will compare the participates' corneal biomechanical properties including: Deformation Amplitude ratio (Da Ratio) Integrated Radius (IR) Stress strain index (SSI) All measurements will be taken before and after 3 months of LVC.
Each Participant will undergo preoperative pentacam and corvis scan for his eyes and the 3 months post operative. The participants are divided into 3 groups, one who underwent LASIK, one PRK and one Femto LASIK. Collected data will before and after surgery will be compared in each arm and then the 3 arms will be compared together.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
33
Measurement of the DA ratio, IR and SSI before and after for patients under gone LASIK, femto LASIK and PRK using the CORVIS device.
Cairo University
Cairo, Egypt
Evaluation of the changes in DA ratio, integrated radius and SSI before and after LVC
Comparison between in DA ratio (DA ratio) in patients undergoing LASIK, Femto LASIK and PRK. Comparison between changes in integrated Radius (IR) in patients undergoing LASIK, Femto LASIK and PRK. Comparison between changes in Stress strain index (SSI) in patients undergoing LASIK, Femto LASIK and PRK. Each indices will be compared before and after the Laser vision correction (LVC) procedure and the indices are not to be compared to each other to have have a fixed unit measure. I reviewed your comment and I dont see any conflicts, to clarify how multiple measurements will be aggregated to arrive at one reported value again I am going to measure each index and compare it with "itself' before and after 3 different LVC.
Time frame: 3-6 months post operative
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