Jun 24, 2024 · Positive numbers on an eye prescription indicate they are correcting farsightedness, while negative numbers correct shortsightedness. A larger number suggests a …

Negative eye power means you need a negative lens or a minus-powered lens to make the rays of light focus on the retina. In other words, a minus-numbered lens will help you see clearly. …

Oct 29, 2025 · This is the amount of prismatic power prescribed to compensate for diplopia (double vision) caused by eye alignment problems. It’s measured in prism diopters, which may …

Jun 13, 2025 · In this article, we’ll help you interpret your prescription, understand potential risks, discover practical steps to protect your vision, and learn what’s considered legally blind.

Apr 12, 2021 · We’ll help you make sense of the abbreviations and numbers that may be included in your eye prescription while explaining how prescriptions vary depending on your vision issues.

The numbers you see written in your eye prescription under some abbreviations like OD, OS, and SPH determine your eye power.

The simple reason is because contact lenses sit directly on your eyes, while eyeglasses are held in front of your eyes. Though the prescriptions may appear similar, they will differ in strength …

Mild: -0.50 to -3. Moderate: -3.25 to -5.00. High: -5.25 to -10. Extreme: greater than-10. However, that’s not all there is to know in learning how to read an eye prescription. Read on for a simple …

Dec 25, 2023 · Confused by those mysterious letters on the vision chart? What do the test results on the eyes mean? Numbers, lines, and vision score.

VA (visual acuity) refers to how clearly you can see shapes and detail from a set distance away (six metres in the UK), with your glasses on if you wear them. It is shown as a fraction and the …