What does the minus or plus mean in prescription?

[Indian River Shores]

I often see the minus or plus mark in prescription,what do they mean?

[Indian Rocks Beach]

A plus sign indicates that the designated eye is farsighted, while a minus sign indicates that the designated eye is nearsighted. This is measured in diopters, the unit of measurement that indicates the nearsightedness or farsightedness of the eye. Diopters are normally abbreviated to a simple D, so an OD -1.25 indicates that a patient is one and one quarter of a diopter farsighted in their right eye.

[Indian Shores]

The minus "-" means you are nearsighted while the plus means you are farsighted.