The near point is the point closest to the bridge of the nose where convergence and binocular single vision can no longer be maintained as an object approaches.
Also known as Accommodation and R-50 Rule, the Near Point Rule measures 50 cm long, 10 mm square, it is engraved with Centimeters, Inches, Diopter Scales and Duane Age (the mean of the near point of accommodation at different ages according to Duane) with sliding card holder.
Made of gray opaque plastic with white markings.