Abstract
In this work, we analyze the way in which pupil size, optical zone, and initial hyperopic level influence optical quality for hyperopic Q-optimized corneal refractive surgery. Different Q-optimized algorithms and the Munnerlyn formula were tested to analyze the optical quality of the final retinal image for initial hyperopic errors from 1D to 5D. Three optical zones (5.5, 6, and 6.5 mm) and two pupil diameters (5 and 7 mm) were considered. To evaluate optical quality, we computed the modulation transfer function (MTF) and the area under MTF (MTFa). Q-optimized values at around Q = -0.18 were found to provide the best optical quality for most of the conditions tested. This optimum final asphericity for hyperopic ablation was not depending on the degree of hyperopia corrected, the optical zone or the pupil size being this information important for clinical practice.
Highlights
Of the many theoretical and experimental studies on visual quality after corneal refractive surgery, most refer to myopia [1,2,3,4,5,6,7,8,9,10] while fewer examine hyperopia [11,12,13,14,15,16]
We test different post-operative Q values and compare the results with those found using the Munnerlyn formula. This is the first study available that provides a theoretical analysis on this topic and it can be useful in clinical practice in order to choose the final Q value for hyperopic surgery based on different variables, such as optical zone, pupil size, and initial degree of hyperopia
modulation transfer function (MTF) curves show that for low-medium frequencies the Munnerlyn algorithm provides the best results while for high frequencies (>35 cpd) the algorithm Q = −0.18 offers better MTF. This occurs for a pupil size larger and smaller than the optical zone tested
Summary
Of the many theoretical and experimental studies on visual quality after corneal refractive surgery, most refer to myopia [1,2,3,4,5,6,7,8,9,10] while fewer examine hyperopia [11,12,13,14,15,16]. Different works [9,10,24,25,26] have analyzed the relation of the optical zone, pupil size, and the initial degree of myopia to visual quality and NVD after myopic surgery. We test different post-operative Q values and compare the results with those found using the Munnerlyn formula This is the first study available that provides a theoretical analysis on this topic and it can be useful in clinical practice in order to choose the final Q value for hyperopic surgery based on different variables, such as optical zone, pupil size, and initial degree of hyperopia
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