The highest range of myopia, as defined by severity categories, is high myopia, which starts at -6.0 diopters or more.
Understanding the different ranges of myopia is crucial for assessing the severity of nearsightedness. Myopia is measured in diopters (D), where a negative number indicates the degree of correction needed for distance vision. The higher the absolute value of the negative number, the stronger the prescription and the more severe the myopia.
Based on standard classifications referenced:
- Mild Myopia: Ranges from 0 to -1.5 diopters.
- Moderate Myopia: Ranges from -1.5 diopters up to -6.0 diopters.
- High Myopia: Defined as -6.0 diopters or more.
People with pathological myopia typically have more than -8.0 diopters, representing a particularly severe form often associated with increased risks of eye complications. While pathological myopia indicates a very high degree, "high myopia" is generally the term used to categorize this highest range of severity before specifying the pathological subtype.
Understanding Myopia Ranges
The classification helps eye care professionals understand the potential impact of myopia on a person's vision and eye health.
Here is a quick summary of the ranges:
| Myopia Severity | Diopter Range |
|---|---|
| Mild | 0 to -1.5 D |
| Moderate | -1.5 D to -6.0 D |
| High | -6.0 D or more |
| Pathological | More than -8.0 D |
Note: Pathological myopia is a specific type of high myopia associated with structural changes in the eye.
Risks Associated with Moderate and High Myopia
It's important to note that moderate to high myopia increases the risk of various eye diseases. As highlighted in the reference, eye diseases such as retinal diseases, cataracts, and glaucoma can occur in people with moderate to high myopia. This is because severe myopia can lead to elongation of the eyeball, stretching and thinning the retina and other eye structures, making them more vulnerable.
For individuals with high myopia, regular comprehensive eye exams are essential to monitor for these potential complications and ensure timely intervention if needed.
