I have -2.5 eye power. Can I fit the criteria of a 6/9 vision and, if not, what exactly does my eye vision fit to?

To address your question, let's break down the concepts of diopters and visual acuity.

Understanding Diopters

• Diopters measure the optical power of lenses, with higher numbers indicating stronger prescriptions. A negative diopter value, like -2.5, indicates nearsightedness (myopia), meaning you can see close objects clearly but struggle with distant ones15.
• Your prescription of -2.5 diopters suggests you have a moderate level of nearsightedness.

Understanding Visual Acuity

• Visual acuity measures the sharpness of vision. A visual acuity of 6/6 (or 20/20 in the US system) is considered normal, meaning you can see at 6 meters what an average person can see at the same distance24.
• A visual acuity of 6/9 indicates that you can see at 6 meters what an average person can see at 9 meters. This means your vision is not as sharp as normal vision.

Can You Fit the Criteria of 6/9 Vision?

• With a prescription of -2.5 diopters, you likely have some difficulty seeing distant objects clearly without correction. However, with corrective lenses, your visual acuity can be improved to potentially match or exceed a 6/9 level, depending on other factors like the quality of your lenses and any additional vision issues.
• Without correction, your uncorrected visual acuity might be lower than 6/9 due to your nearsightedness.

What Does Your Eye Vision Fit To?

• Without corrective lenses, your visual acuity is likely less than 6/6 due to your nearsightedness. However, with corrective lenses, you can achieve a visual acuity close to or better than 6/6, depending on the quality of the correction and any other vision issues you may have.

In summary, while your uncorrected vision might not fit the criteria of 6/9, with proper correction, you can achieve a visual acuity that meets or exceeds this level.