In FCC testing, what is the initial adjustment applied to the patient’s prescription?

In FCC testing, what is the initial adjustment applied to the patient’s prescription?

• A. Add Plus
• B. Add Minus
• C. Add Neutral
• D. Add Double Plus

Answer: (A)

Fogging with plus power to relax accommodation is the starting move in subjective refraction. By adding a small plus lens, vision is slightly blurred, which reduces the eye’s accommodative effort and prevents latent hyperopia or accommodation from biasing the refraction. This creates a stable, neutral starting point from which you can refine the prescription. Starting with minus would drive the eye to accommodate, potentially masking hyperopia or leading to an incorrect over-minus result. Neutral (no added power) wouldn’t control accommodation at all, and doubling the plus is unnecessarily excessive for an initial step.

Fogging with plus power to relax accommodation is the starting move in subjective refraction. By adding a small plus lens, vision is slightly blurred, which reduces the eye’s accommodative effort and prevents latent hyperopia or accommodation from biasing the refraction. This creates a stable, neutral starting point from which you can refine the prescription. Starting with minus would drive the eye to accommodate, potentially masking hyperopia or leading to an incorrect over-minus result. Neutral (no added power) wouldn’t control accommodation at all, and doubling the plus is unnecessarily excessive for an initial step.