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  Indian J Med Microbiol
 

Figure 5: Detection of prism with lensmeter. Displacement of the cross-line target away from the reticle center indicates presence of prism, with the decentration in the direction of the prism base. In this illustration, the cross-line target is displaced 4 rings to the right, indicating the presence of 2Δ base-in or-out prism if dealing with a spectacle lens for the right eye or left eye respectively

Figure 5: Detection of prism with lensmeter. Displacement of the cross-line target away from the reticle center indicates presence of prism, with the decentration in the direction of the prism base. In this illustration, the cross-line target is displaced 4 rings to the right, indicating the presence of 2<sup>Δ</sup> base-in or-out prism if dealing with a spectacle lens for the right eye or left eye respectively