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Table 6 Comparing the studied cases according to I-Trace after 1 year

From: Objective and subjective evaluation of trifocal diffractive intraocular Lens after cataract extraction with phacoemulsification: a prospective clinical study

I-Trace

Pre-operation

Post operation 1 year

p

Defocus (μ)

Positive

 Min. – Max.

0.075–6.288

0.023–1.304

Zp=0.109

 Mean ± SD.

2.290 ± 1.859

0.266 ± 0.411

 Median

2.233

0.069

Negative

 Min. – Max.

−1.256 – –0.029

−0.437 – –0.008

 Mean ± SD.

− 0.319 ± 0.525

−0.112 ± 0.162

 Median

−0.101

− 0.046

Astig (μ @)

 Min. – Max.

0.014–1.122

0.030–0.619

Zp=0.043*

 Mean ± SD.

0.434 ± 0.372

0.237 ± 0.187

 Median

0.367

0.170

HO Total (μ)

 Min. – Max.

0.066–0.602

0.061–0.500

Zp=0.345

 Mean ± SD.

0.271 ± 0.163

0.161 ± 0.115

 Median

0.254

0.127

Coma (μ @)

 Min. – Max.

0.013–0.298

0.010–0.200

Zp=0.500

 Mean ± SD.

0.126 ± 0.087

0.068 ± 0.049

 Median

0.114

0.066

Spherical (μ)

Positive

 Min. – Max.

0.018–0.135

0.0–0.049

 Mean ± SD.

0.056 ± 0.038

0.023 ± 0.020

 Median

0.047

0.021

Negative

 Min. – Max.

−0.472 – –0.003

− 0.169 – –0.001

 Mean ± SD.

− 0.168 ± 0.206

−0.042 ± 0.046

 Median

−0.071

− 0.023

2ry Astig (μ @)

 Min. – Max.

0.005–0.331

0.004–0.149

Zp=0.500

 Mean ± SD.

0.059 ± 0.081

0.036 ± 0.037

 Median

0.033

0.021

Trefoil (μ @)

 Min. – Max.

0.026–0.242

0.016–0.340

Zp=0.893

 Mean ± SD.

0.117 ± 0.055

0.104 ± 0.088

 Median

0.129

0.079

RMS (mm)

 Min. – Max.

2.30–5.60

2.0–4.0

tp=0.030*

 Mean ± SD.

3.847 ± 1.053

2.767 ± 0.581

 Median

3.70

2.60

  1. t: Paired t-test Z: Wilcoxon signed ranks test
  2. p: p value for comparing between pre-operation and final
  3. *: Statistically significant at p ≤ 0.05