Image jump-please help

[benice]

hi can anyone help me with this question please?

calculate image jump for:
CR-39 flat top (distance from segment OC to segment top= 4mm) add +1.75D.

thanks.;)

[Darryl Meister]

Just multiply the distance of the segment center in centimeters by the addition power (that is, 0.4 * 1.75 = 0.7 prism diopters).

[benice]

thank u so very much.