Table 2.

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 4 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)	−0.17	−0.06	0.11	−0.32	0.36	0.68	−0.31	0.04	0.35	−0.56	−0.62	−0.06	−0.51	−0.53	−0.02
Cylindrical (D) †	−0.17	−0.20	−0.03	−1.48	−2.03	−0.55	−2.81	−3.18	−0.37	−1.46	−1.12	0.34	−2.80	−2.50	0.30
SEQ (D)	−0.26	−0.16	0.10	−1.06	−0.66	0.41	−1.72	−1.55	0.17	−1.29	−1.18	0.11	−1.91	−1.78	0.13
Focus (μm)	−0.35	−0.12	0.23	−0.64	0.73	1.37	−0.63	0.09	0.72	−1.13	−1.28	−0.15	−1.01	−1.21	−0.20
Astigmatism (μm)	−0.33	−0.40	−0.07	−2.97	−4.05	−1.08	−5.62	−6.36	−0.74	−2.91	−2.23	0.68	−5.61	−5.01	0.60
HOA (μm)	0.02	0.15	0.13	0.04	0.18	0.14	0.04	0.12	0.08	0.04	0.14	0.10	0.04	0.08	0.04
TA (μm)	0.14	0.17	0.03	0.82	0.51	−0.31	1.54	1.09	−0.45	0.85	0.98	0.13	1.50	1.61	0.11
TA at 67 cm (μm)										0.81	0.49	−0.32	1.22	1.01	−0.21
TA at 33 cm (μm)										1.51	0.81	−0.70	1.61	0.52	−1.09

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