PMC6537019_01
(a) Postoperative spherical equivalent relative to the intended target for the SRK/T versus the difference between the effective lens position estimated by the SRK/T formula (ELPSRK/T) and the real obtained from the measurement of the actual lens position and the location of the second principal plane of the IOL (ELPo). (b) Agreement between anterior corneal radius measured with IOLMaster (rk) and Pentacam HR (r1c).
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fig2
The DeltaELP was significantly correlated with the postoperative SE relative to the intended target (r = -0.47, p=0.002) (Figure 2(a)). The anterior corneal radius measured by specular reflection (rk) overestimated the value measured by the Scheimpflug-based devices in 0.03 +- 0.05 [0.03 (0.05)] mm (t = 3.49, p=0.001), and the difference was correlated with the average of both measures (r = -0.36, p=0.02) (Figure 2(b)).
Correlations between the fictitious index (nc) that minimize the postoperative SE for a known effective lens position considering both corneal radii and thickness (a), and the fictitious index (nk) derived from the anterior corneal radius (b).
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fig3
These indexes were correlated with the axial length of the eye, for both nc (r = 0.49, p=0.001) (Figure 3(a)) and nk (r = -0.33, p=0.03) (Figure 3(b)).
Postoperative spherical equivalent relative to the intended target for (a) SRK/T, (b) Barrett Universal II, (c) nk equation, and (d) nc equation (D). Correlations between the postoperative spherical equivalent relative to the intended target and the pupil diameter for (e) nc equation and (f) nk equation.
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fig4
Postoperative SE relative to the intended target was -0.12 +- 0.38 [-0.11 (0.50)] D for the SRK/T (Figure 4(a)), -0.20 +- 0.33 [-0.24 (0.54)] D for Barrett Universal II (Figure 4(b)), -0.01 +- 0.41 [-0.05 (0.62)] D for nk equation (Figure 4(c)), and -0.02 +- 0.40 [0.01 (0.57)] D for nc equation (Figure 4(d)). The predictability was significantly correlated with pupil diameter for nc equation (r = -0.50, p=0.001) (Figure 4(e)) and for nk equation (r = -0.51, p < 0.0005) (Figure 4(f)).