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Published on: April 3, 2016
Clinical findings before the onset of myopia in youth. I. Ocular optical components
1School of Optometry, Indiana University, Bloomington, USA.
Purpose:
A study was conducted to identify variables that were different in children who were emmetropic and became myopic and in children who remained emmetropic.
Methods:
A cohort of initially emmetropic children had eye and vision examinations at 6-month intervals for a period of 3 years. Ocular optical components were measured by keratometry and ultrasonography. Crystalline lens power was calculated using Bennett's formulas.
Results:
There was a tendency for keratometer power of both principal meridians to be greater in the became-myopic group than in the remained-emmetropic group. Axial length to corneal radius (AL/CR) ratio was significantly greater in the became-myopic group than in the remained-emmetropic group. The variable with the highest sensitivity and specificity was the AL/CR ratio using the horizontal meridian corneal radius.
Conclusions:
Greater corneal powers and greater AL/CR ratios are risk factors for youth onset myopia.
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