Influence of pupil and optical zone diameter on higher-order aberrations after wavefront-guided myopic LASIK

Abstract

The OZ zone to pupil ratio (fractional clearance) had a significant impact on HOA induction after wavefront-guided LASIK.

Factors affecting the change in lower-order and higher-order aberrations after wavefront-guided laser in situ keratomileusis for myopia with the Zyoptix 3.1 system

“…With both PDs, smaller OZ diameters were correlated with higher induction of coma RMS and Z 4 0 . Studies show that the higher the relation between the OZ and PD, 26,27 the smaller the induction of spherical aberrations after LASIK. [27][28][29] The present study confirmed the importance of fractional clearance (FC, the OZ to PD ratio) 27 : The OZ diameter plays a marginal role if FC is high (in this study, 3.5 mm pupil); if FC is lower (in this study, 6.0 mm), it was significantly inversely correlated with HOA induction (Figure 2, A and B).…”

“…Studies show that the higher the relation between the OZ and PD, 26,27 the smaller the induction of spherical aberrations after LASIK. [27][28][29] The present study confirmed the importance of fractional clearance (FC, the OZ to PD ratio) 27 : The OZ diameter plays a marginal role if FC is high (in this study, 3.5 mm pupil); if FC is lower (in this study, 6.0 mm), it was significantly inversely correlated with HOA induction (Figure 2, A and B). The influence of OZ diameter on coma induction could only be determined by looking at coma RMS values that became larger with higher positive or negative shifts of the individual coma terms and therefore were more sensitive to random decentration of the OZ than individual coma terms.…”

Comparison of 2 multiple-measurement infrared pupillometers to determine scotopic pupil diameter

“…Refractive surgery with a relatively small OZ can produce higher-order aberrations (HOAs), poor optical quality, reduced contrast sensitivity, and increased glare disability. [2][3][4][5][6] Despite the use of large ablation zones, issues related to quality of vision have been described in many clinical studies of photorefractive keratectomy and laser in situ keratomileusis. 3,4,[7][8][9] The most common patient complaints are glare, halos, and diminished night vision.…”

The influence of the aspheric profiles for transition zone on optical performance of human eye after conventional ablation

“…It is well-known that pupil size had a significant influence on the residual wavefront aberration RMS, especially for the condition of optical zone diameter larger than pupil size [21]. Also, our previous results indicated that the change in HOA root mean square and spherical aberration was significantly correlated with the optical zone to pupil ratio [7].…”