If the P.D.=65/62 and the Rx=+4.00 OU, Add +4.00, what is the recommended inset?

To determine the recommended inset when the pupillary distance (P.D.) is 65mm for distance and 62mm for near, and the prescription is +4.00 in both eyes (OU) with an addition of +4.00, we need to consider how the inset is calculated for progressive lenses or bifocals.

For presbyopic patients, as in this case with the +4.00 add, the inset is crucial for ensuring that the optical center of the lens aligns properly with the wearer's pupils, especially when there is a significant difference in the distance P.D. and the near P.D.

The formula for calculating the inset can involve the difference in P.D. values between distance and near. In this instance:

1. The distance P.D. is 65mm, and the near P.D. is 62mm.

2. The difference between these two measurements is 65 - 62 = 3mm. This 3mm is the total amount by which the optical centers must be inset toward the nose for proper alignment.

In a standard situation, this 3mm should be divided by 2 for each eye, resulting in an inset of approximately 1.5mm for each eye (