Centers ground wide in plus lenses will result in _________.

When a plus lens has its optical centers positioned further apart than the patient’s pupils, it creates a situation where the light entering the lens is bent in a way that induces prism effects. In this scenario, the optical principle at play is related to how light is refracted through the lens when viewed from different angles.

In the case of widely spaced optical centers in plus lenses, each eye perceives an angle of deviation that leads to a base out induced prism effect. This occurs because the actual optical center of the lens is misaligned with the eye's line of sight, causing outward displacement of the image seen through the lens as compared to what the eye would naturally perceive without corrective lenses. This misalignment can lead to discomfort, blurred vision, or even double vision for the wearer.

Understanding this concept is crucial in the fitting of glasses, particularly for those needing plus prescriptions, as proper alignment of the optical centers to a person's pupillary distance is essential for maintaining visual comfort and clarity.