How many degrees is high myopia?

Sep 13, 2022 Source: Cainiu Health

Dr. Chen You

Introduction

Myopia is classified as follows: mild myopia ranges from 0 to 300 degrees, moderate myopia from 300 to 600 degrees, and high myopia is over 600 degrees. Myopia exceeding 900 degrees, or in some cases 800 degrees, is referred to as extreme high myopia. If a patient's myopia exceeds 1000 degrees, it is considered extreme high myopia. Myopia is categorized into mild, moderate, and high degrees, with significant differences among them.

With rapid societal development, people increasingly rely on electronic devices—such as smartphones. Prolonged smartphone use can easily lead to myopia (nearsightedness). If poor visual habits persist after meals, this may progress to high myopia. So, what degree of refractive error constitutes high myopia?

What Degree Defines High Myopia?

Myopia is categorized as follows: mild myopia (0–300 diopters), moderate myopia (300–600 diopters), and high myopia (>600 diopters). Myopia exceeding 900 diopters—or sometimes defined as over 800 diopters—is termed “extreme” or “severe” high myopia. When refractive error surpasses 1000 diopters, it is definitively classified as extreme high myopia.

The distinctions among mild, moderate, and high myopia are substantial. Consequently, some individuals mistakenly assume they have myopia and wear corrective lenses of 600, 500, or 400 diopters—yet this notion is entirely incorrect. High myopia differs fundamentally from mild myopia and carries significantly greater risks for ocular complications.

The higher the myopic refractive error, the longer the eyeball remains elongated. Prolonged axial elongation increases susceptibility to posterior segment complications—including retinal detachment. In contrast, mild myopia rarely leads to retinal detachment. Therefore, even in cases of mild myopia, patients should proactively prevent progression to high myopia. Daily habits matter: avoid prolonged use of electronic devices such as televisions, computers, and smartphones; refrain from chronic sleep deprivation; and spend more time outdoors gazing into the distance. We hope this information proves helpful. Wishing you optimal health and a joyful life.

Related Articles

View All

What is the highest degree of myopia?

From the perspective of common clinical classifications, myopia exceeding 600 degrees is considered high myopia, and over 1200 degrees is classified as very high myopia. Although these conditions are relatively rare in the general population, the number of individuals with high myopia has been gradually increasing due to changes in eye usage habits. Most patients with high myopia can maintain normal daily lives through appropriate correction, provided that no severe structural abnormalities have developed in the eye.

View Full Answer

How to recover from myopia in children's eyes

Children's myopia cannot be reversed. The key to improvement lies in controlling the progression of myopia, which can be achieved through scientifically prescribed eyeglasses, developing good eye-use habits, increasing outdoor activities, performing standardized eye exercises, and adjusting dietary patterns. These interventions help prevent myopia from progressing to high myopia. If you notice symptoms such as blurred vision or squinting in your child, it is recommended to seek timely medical evaluation and refraction testing.

View Full Answer

Can normal eye pressure rule out glaucoma?

Normal intraocular pressure does not completely rule out glaucoma, as glaucoma diagnosis requires comprehensive evaluation. Some glaucoma patients have intraocular pressure within the normal range, while those with elevated pressure also require additional tests for confirmation—diagnosis cannot be based solely on a single measurement. High-risk individuals, such as those with a family history of glaucoma or high myopia, should undergo a comprehensive eye examination every six months to one year.

View Full Answer

Which department should I visit for seeing black shadows in my eyes?

In general, the appropriate medical department for eye floaters should be selected based on the specific underlying cause. Common departments include ophthalmology, neurology, endocrinology, emergency medicine, and general practice. Daily precautions include avoiding strenuous exercise and eye injuries. Individuals with high myopia or diabetes should undergo regular fundus examinations. When floaters appear, avoid excessive anxiety and choose the appropriate specialty according to accompanying symptoms.

View Full Answer

Do I need to wear my glasses all the time after getting them?

In general, whether glasses should be worn all the time depends on the prescription strength and specific visual tasks. Adolescents with high myopia, astigmatism, or hyperopia usually need to wear glasses continuously, while adults with mild myopia who primarily engage in near-vision activities may not need to wear them all the time. Regular eye examinations are recommended—every six months for adolescents and annually for adults.

View Full Answer

Is glaucoma serious?

In general, the seriousness of glaucoma depends on the timing of intervention. If detected early and properly treated, it is usually not a major concern; however, if diagnosis and treatment are delayed, leading to optic nerve damage, it becomes very serious. Regular eye examinations should be part of daily health habits, especially for high-risk individuals such as those with a family history of glaucoma or high myopia. Avoid prolonged stays in dark environments and reduce eye strain.

View Full Answer

Why is high myopia hereditary?

High myopia can be hereditary, generally associated with autosomal recessive inheritance, pathogenic genes affecting axial length of the eye, genetic polymorphisms increasing susceptibility, and parental myopia elevating risk. Most cases of high myopia follow this inheritance pattern; when both parents carry the pathogenic gene but are unaffected, their children have a higher probability of inheriting two copies of the pathogenic gene, leading to high myopia, with a disease incidence higher than that of the general population.

View Full Answer

Will not wearing glasses for myopia cause dizziness?

Whether myopia causes dizziness when not wearing glasses depends on the degree of myopia and the visual demands of the situation. Individuals with mild myopia who rarely engage in near-vision tasks usually do not experience dizziness, whereas those with moderate to high myopia or those requiring clear vision may feel dizzy. To protect vision, proper daily eye care is essential. After developing myopia, one should have a timely eye examination and wear appropriate corrective lenses as needed. Avoid prolonged continuous eye use; take breaks by looking into the distance every 30 minutes.

View Full Answer

Your trusted source for health information and wellness guidance.

Quick Links

Resources

Connect

© 2024 HealthPortal. All rights reserved.