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A virtual model to assess maximum treatable area in LASIK and feasibility of a temporal hinge
Ameya Rajas Deepak Ingawale1, Jagadeesh K Reddy2, K S Siddharthan2
1Cornea and Refractive Surgery, Sankara Eye Care Institutions, Coimbatore, India. ameya.ingawale87@gmail.com.
Purpose:
To generate virtual models using different hinge locations and to investigate the advantages of a temporal hinge to a superior in LASIK.
Methods:
The study design was cross sectional. An image processing software was used to construct virtual LASIK models of 56 slit lamp photos of eyes. For a given hinge location and width, the largest flap diameter and maximum treatable stromal bed area were calculated, comparing temporal hinge to superior.
Results:
Temporal hinge allowed a greater flap diameter than superior and thus a greater treatment zone area for a given hinge width. A temporal hinge allowed a greater hinge width than a superior hinge for a given treatment zone area.
Conclusion:
We provide a rational basis for a mechanically stable temporal hinge. Moreover, we provide a method to pre-operative model flap size and hinge location, using a slit lamp camera and an image editing software.
