What is the prescription for the reading level when the total prism is determined?

In the context of prescriptions involving prism measurements, determining the appropriate power for reading involves considering the total prism that has been calculated. It is standard to use a reference value that guides optometrists or ophthalmologists in prescribing the right lens power based on the established prism requirements for near visual tasks.

Specifically, a prescription of +2.50 diopters for both eyes (OU) is commonly used as it accommodates the average additional power needed for clear near vision, especially when compensating for the effects of prism in reading. This choice balances the optical system to ensure that the image remains clear and that binocular vision is maintained under the specific conditions described by the prism value.

The other options reflect varying prescriptions that are not aligned with the most typical adjustments accepted in practice for the total prism scenario, leading to potential over or under-correction that might not provide optimal reading comfort and visual clarity. Thus, the selection of +2.50 OU becomes the most rational and effective choice for this scenario.