How many degrees is considered high myopia?

Oct 20, 2023 Source: Cainiu Health

Dr. Wang Shuai

Introduction

一般情况下，高度近视是指600度以上。对高度近视Patient而言，日常需要养成良好的用眼习惯，避免长时间用眼，控制好用眼时间，避免近视度数加深。日常也要佩戴好眼镜，必要时可以配合Doctor进行近视Surgery，帮助视力恢复。

Generally, high myopia refers to myopia of over 600 degrees. The details are as follows:

Myopia can be classified into mild, moderate, high, and extremely high myopia based on the degree of correction needed. Myopia below 300 degrees is considered mild, between 300 and 600 degrees is moderate, over 600 degrees is high myopia, and over 1000 degrees is considered extremely high myopia. High myopia exceeding 600 degrees may be associated with a series of fundus abnormalities; this type is also known as pathological myopia. In addition to blurred distance vision, patients may experience symptoms such as floaters and flashes of light, and night vision may deteriorate. In these patients, the axial length of the eye is typically elongated, which increases the risk of developing posterior scleral staphyloma.

For individuals with high myopia, it's important to develop good eye-use habits in daily life—avoid prolonged eye use, manage eye-strain time effectively, and prevent further progression of myopia. Wearing appropriate corrective glasses regularly is essential. When necessary, patients may consider refractive surgery under medical guidance to help restore vision.

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How many degrees is high myopia?

In general, high myopia usually refers to a refractive error greater than 600 degrees. Patients with high myopia are advised to undergo regular fundus examinations to allow timely detection and treatment as directed by a physician. This type of myopia is defined in ophthalmology as pathological myopia, which presents clear clinical symptoms such as significant vision decline and visual fatigue, and corrected vision is difficult to restore to normal levels.

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Is high myopia hereditary?

Whether high myopia is hereditary depends on the specific circumstances. If both parents have high myopia, it may be inherited; if not both parents have high myopia, inheritance is less likely. It is recommended to seek medical advice promptly and receive treatment under the guidance of a doctor. Regular vision check-ups and proper eye protection are also important in daily life.

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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.