| What is a diopter? |
| A diopter is a unit of measurement that determines your prescription. A minus sign in front of the number means you are nearsighted, a plus sign means you are farsighted. |
Ask Millenium
| What is a diopter? |
| A diopter is a unit of measurement that determines your prescription. A minus sign in front of the number means you are nearsighted, a plus sign means you are farsighted. |