Standard for Myopia Classification
May 16, 2022
Source: Cainiu Health
Dr. Chen You
Introduction
The classification of myopia is based on the degree of refractive error and is divided into three categories: mild, moderate, and high myopia. Myopia of less than −3.00 diopters (D) is classified as mild; −3.00 D to −6.00 D as moderate; and greater than −6.00 D as high myopia. High myopia—also known as progressive or pathological myopia—tends to worsen progressively with age.
With improving living standards and the widespread use of electronic devices, myopia is increasingly common among adolescents; in some cases, the condition is severe enough to impair academic performance. So, what are the criteria for classifying myopia?
Classification Criteria for Myopia
Myopia is classified into three categories—mild, moderate, and high—based on refractive error (measured in diopters). Mild myopia refers to refractive errors under −3.00 D; moderate myopia ranges from −3.00 D to −6.00 D; and high myopia is defined as refractive error exceeding −6.00 D. High myopia—also termed progressive or malignant myopia—tends to worsen with age and may lead to complications such as cataracts, vitreous opacities, and retinal disorders.
Mild myopia (under −3.00 D): Remove corrective glasses during near-vision tasks (e.g., reading or writing) to reduce visual fatigue and slow progression. Moderate myopia (−3.00 D to −6.00 D): Wear glasses full-time and maintain proper posture while studying. Depending on individual severity, patients may also consider treatment via femtosecond laser surgery.
Femtosecond laser myopia correction is now a routine ophthalmic surgical procedure. Its key advantages include minimal tissue trauma, high surgical precision, and excellent postoperative visual quality. Generally, this procedure is suitable for individuals aged 18 years or older with myopia up to −15.00 D. The current cost of the surgery is approximately RMB 18,000. We hope this information proves helpful!
