Final answer:
The formula to calculate segment inset with a Mono PD is Segment Inset = PD - Standard Pupilary Distance. PD is the measurement between the centers of the pupils and Standard Pupilary Distance is typically 62 mm.
Step-by-step explanation:
The formula to calculate segment inset with a Mono PD is:
Segment Inset = PD - Standard Pupilary Distance
Where PD stands for Pupilary Distance, which is the measurement between the centers of the pupils of the eyes, and Standard Pupilary Distance is the average distance between the centers of the pupils, which is typically 62 mm.
For example, if a person's PD is 65 mm, the segment inset would be 65 mm - 62 mm = 3 mm.