Effects of varying illumination on ocular aberrations and aberration compensation before and after small incision Lenticule extraction: a prospective cohort study

Table 4 Pre- and postoperative third- to sixth-order aberrations under mesopic and photopic illumination

HOAs	Mesopic illumination	Photopic illumination	t	p-value^a
Preoperative HOAs (μm)
S3	0.442 [0.333]	0.118 [0.069]	1.300	.201
S4	0.344 [0.280]	0.080 [0.092]	1.352	.184
S5	0.122 [0.103]	0.041 [0.040]	1.277	.209
S6	0.096 [0.090]	0.031 [0.040]	1.478	.148
Total S3-S6	0.593 [0.446]	0.160 [0.137]	1.329	.191
Postoperative HOAs (μm)
S3	0.658 [0.614]	0.153 [0.163]	4.427	< .001
S4	0.860 [1.053]	0.090 [0.076]	6.277	< .001
S5	0.239 [0.203]	0.040 [0.032]	4.354	< .001
S6	0.276 [0.212]	0.036 [0.025]	7.128	< .001
Total S3-S6	1.201 [1.376]	0.189 [0.197]	5.515	< .001

Data are presented as the median [interquartile range].
HOA higher-order aberration, S3 root mean square of third-order aberrations, S4 root mean square of fourth-order aberrations, S5 root mean square of fifth-order aberrations, S6 root mean square of sixth-order aberrations, total S3-S6 combined root mean square of third- to sixth-order aberrations.
^aDifferences between HOAs under mesopic and photopic illumination; two-sample paired t-test

ISSN: 1471-2415