How much maximum prism can prescribe in spectacles?

The maximum amount of prism that can be prescribed in spectacles typically ranges from 4 to 6 diopters for most patients. However, in certain cases, higher amounts may be prescribed, up to 10 diopters or more, depending on the individual's specific needs and conditions. It's essential to consider factors such as the patient's comfort, visual acuity, and the potential for prism-induced distortions when determining the appropriate amount. Ultimately, the decision should be made by an eye care professional based on a thorough assessment.