A plus lenticular is used with GP prescriptions to decrease edge thickness in which scenario?

A plus lenticular is used with GP prescriptions to decrease edge thickness in which scenario?

• A. High plus
• B. High minus
• C. Low plus
• D. Low minus

Answer: (B)

A plus lenticular is used to manage edge thickness when the spectacle lens must have a lot of material at the edges, as happens with high minus prescriptions. For a high minus lens, the edge tends to be thick to achieve the minus power, which can be undesirable aesthetically and mechanically. Adding a plus lenticule around the periphery provides positive power at the outer zones, allowing the same overall minus effect to be achieved with less edge material. In short, it redistributes thickness so the edge is thinner while preserving the needed optical power in the center. This isn’t needed for high plus, where edge thickness isn’t the same concern, and it’s not typically used for low-plus or low-minus situations where edge thinning isn’t a limiting factor.

A plus lenticular is used to manage edge thickness when the spectacle lens must have a lot of material at the edges, as happens with high minus prescriptions. For a high minus lens, the edge tends to be thick to achieve the minus power, which can be undesirable aesthetically and mechanically. Adding a plus lenticule around the periphery provides positive power at the outer zones, allowing the same overall minus effect to be achieved with less edge material. In short, it redistributes thickness so the edge is thinner while preserving the needed optical power in the center.

This isn’t needed for high plus, where edge thickness isn’t the same concern, and it’s not typically used for low-plus or low-minus situations where edge thinning isn’t a limiting factor.