Table 1.

Seidel refraction and Seidel aberrations coefficients with and without the horizontal slit, and the amount of change in the setting of an analysis pupil diameter of 6 mm and a slit size of 2 mm

	Emmetropia			− 1.50 D WTR			− 3.00 D WTR			− 1.50 D ATR			− 3.00 D ATR
	No slit	Slit	Change	No slit	Slit	Change	No slit	Slit	Change	No slit	Slit	Change	No slit	Slit	Change
Spherical (D)	−0.11	0.14	0.25	−0.28	1.21	1.49	−0.31	0.46	0.77	−0.29	−0.74	−0.45	−0.25	−0.60	−0.35
Cylindrical (D) †	−0.06	−0.47	−0.41	− 1.44	−3.55	−2.11	−2.88	−3.99	−1.11	− 1.48	−0.15	1.33	− 2.85	− 2.03	0.82
SEQ (D)	−0.14	− 0.10	0.05	−1.00	−0.57	0.44	−1.75	−1.54	0.22	−1.03	−0.82	0.22	−1.68	−1.62	0.06
Focus (μm)	−0.49	0.61	1.10	−1.25	5.44	6.69	−1.37	2.06	3.43	−1.32	−3.33	−2.01	−1.14	−2.71	−1.57
Astigmatism (μm)	−0.70	−2.11	−1.41	−6.49	−15.96	−9.47	−12.95	−17.94	−4.99	−6.66	−0.69	5.97	−12.81	−9.15	3.66
HOA (μm)	0.05	0.18	0.13	0.04	0.66	0.62	0.05	0.39	0.34	0.04	0.52	0.48	0.04	0.22	0.18
TA (μm)	0.32	0.30	−0.02	1.83	0.59	−1.24	3.51	1.16	−2.35	1.85	2.21	0.36	3.41	3.91	0.50
TA at 67 cm (μm)										1.82	0.62	−1.20	2.73	2.14	−0.59
TA at 33 cm (μm)										3.43	1.97	−1.46	3.59	0.57	−3.02

D = diopter; WTR = with-the-rule; ATR = against-the-rule; SEQ = spherical equivalent; HOA = high-order aberrations; TA = total aberrations

^† Cylinder axis is WTR in emmetropia, − 1.50 D WTR, and − 3.00 D WTR astigmatism and is ATR in − 1.50 D ATR and − 3.00 D ATR astigmatism