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Original ArticleOpen Access
Flap Analysis : Critical Point in Laser in Situ Keratomileusis
Srivannaboon S 
A prospective study of 151 eyes, which underwent laser
in situ
keratomileusis, was done.
Corneal flap creation was performed by using Moria LSK-One microkeratome (160 micrometers
thickness) (distributed by Microtech, Inc., Moria, France). Flap thickness (measured by high fre-
quency ultrasound), flap diameter (both horizontal and vertical), hinge size and pupillary hinge dis-
tance were recorded. The actual values from the measurement were compared to the predicted
values from the microkeratome. The mean flap thickness was 161
เธ‘
38 micrometers compare to 160
micrometers predicted value. The mean diameter of the flap was 9.00
เธ‘
0.64 mm vertical and 8.94
เธ‘
0.54 mm horizontal compare to 9.00 mm predicted value. The hinge size was 4.75
เธ‘
0.84 mm. The
pupillary-hinge distance was 3.35
เธ‘
0.61 mm. There was very high variable of the flap thickness,
which can lead to miscalculation of the residual stroma. This miscalculation will be very critical
if the residual stroma is left too thin. Caution should be made in higher level of myopia to avoid the
serious complication such as keratectasia.
Key word
: Laser
in Situ
Keratomileusis, Corneal Flap, Residual Stromal Calculation
in situ
keratomileusis, was done.
Corneal flap creation was performed by using Moria LSK-One microkeratome (160 micrometers
thickness) (distributed by Microtech, Inc., Moria, France). Flap thickness (measured by high fre-
quency ultrasound), flap diameter (both horizontal and vertical), hinge size and pupillary hinge dis-
tance were recorded. The actual values from the measurement were compared to the predicted
values from the microkeratome. The mean flap thickness was 161
เธ‘
38 micrometers compare to 160
micrometers predicted value. The mean diameter of the flap was 9.00
เธ‘
0.64 mm vertical and 8.94
เธ‘
0.54 mm horizontal compare to 9.00 mm predicted value. The hinge size was 4.75
เธ‘
0.84 mm. The
pupillary-hinge distance was 3.35
เธ‘
0.61 mm. There was very high variable of the flap thickness,
which can lead to miscalculation of the residual stroma. This miscalculation will be very critical
if the residual stroma is left too thin. Caution should be made in higher level of myopia to avoid the
serious complication such as keratectasia.
Key word
: Laser
in Situ
Keratomileusis, Corneal Flap, Residual Stromal Calculation
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