| Sumario: | Purpose: To compare the measurement of AC/A ratios while using the gradient method with plus or minus lenses at a fixed near point Method: A convenience sampling method of 30 Malaysians aged 13 to 30 years was used in this study. Relevant demographic and clinical data were obtained. The measurement of the near phoria was performed with a Maddox wing using both plus and minus lenses. The AC/A ratios with ±3.00 diopter (D) lenses were compared. The data were analyzed using the Wilcoxon Signed Rank test to investigate the changes in AC/A ratio while using plus and minus lenses. Result: The mean age of the subjects was 23.46±5.09 years. The mean AC/A ratios with plus lenses and minus lenses were 2.14±0.85 and 1.53±0.71, respectively. The AC/A ratio measured via the gradient method was significantly different (p=0.002). However, the association of AC/A ratio and phoria among gender and age groups was not significant (p>0.05). Conclusion: This study shows that the gradient AC/A ratio with a +3D lens is significantly different from a -3D lens. Clinically, we should use both plus and minus lenses while measuring the AC/A ratio with the gradient method rather than a single lens type.
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