Table 3.

 Assessment of agreement between repeated measurements of horizontal (A) and vertical (B) threshold aniseikonia

	1st reading	2nd reading	Difference between readings	Coefficient of repeatability
	Mean (SD)	Mean (SD)	Mean (SD)
(A) Induced horizontal aniseikonia with size lenses
−9%	−8.4 (1.10)	−7.8 (0.54)	1 (0.53)	1.05
−5%	−4.5 (0.47)	−4.7 (0.42)	0.3 (0.42)	0.84
0%	−0.2 (0.59)	−0.05 (0.55)	0.5 (0.53)	1.05
5%	4.0 (0.71)	4.3 (0.63)	0.5 (0.41)	0.82
9%	8.0 (1.07)	8.1 (0.96)	0.6 (0.52)	1.03
Mean (SD)			0.58 (0.519)	1.03 (0.119)
(B) Induced vertical aniseikonia with size lenses
−9%	−7.8 (1.14)	−7.9 (0.85)	0.7 (0.53)	1.06
−5%	−4.6 (0.83)	−4.7 (0.42)	0.3 (0.42)	0.88
0%	0.1 (0.62)	0.3 (0.43)	0.45 (0.37)	0.74
5%	4.7 (1.13)	4.5 (1.10)	0.5 (0.41)	0.82
9%	8.1 (0.70)	7.8 (0.48)	0.8 (0.42)	0.84
Mean (SD)			0.57 (0.440)	0.84 (0.119)

N, 10.

Two readings were taken on 10 subjects in the control group (Nos 1, 3, 5, 7, 9, 10, 11, 12, 13, and 15) with a 2 week interval. Induced aniseikonia with size lenses, magnification (m): −9%, −5%, 0%, 5%, 9%.