Abstract: also known as accommodative myopia, it is generally over accommodation of the lens. Therefore, distant light is imaged in front of the retina after entering the eye, and the axial diameter length of the eye is normal. Pseudomyopia, when looking at distant objects, also has some regulatory effects.
myopia classification has not been unified, and there will be a variety of classifications from different angles. Common classifications are:
1. According to the degree of myopia,
⑴ – 3.00d, it is called mild myopia.
(2) -3.00d ~ -6.00d were moderate myopia.
(3) -6.00d or above is high myopia, also known as pathological myopia.
2. According to the refractive components
(1) axial myopia is caused by the excessive development of the anterior and posterior axis of the eye.
⑵ curvature myopia is caused by excessive bending of the cornea or lens surface.
diopter myopia is caused by high diopter of refractive stroma.
3. According to the influence of eye regulation, it can be divided into pseudomyopia, true myopia and mixed myopia.
⑴ pseudomyopia: also known as accommodative myopia, it is generally over accommodation of the lens. Therefore, the distant light is imaged in front of the retina after entering the eye, and the length of the axial diameter of the eye is normal. Pseudomyopia, when looking at distant objects, also has some regulatory effects. Pseudomyopia is generally due to long-time close work, poor eye posture, lying on the table, lying in bed or reading in the turbulent carriage; Too strong and too weak light often makes the ciliary muscles of the eyes tense and tired, resulting in vision loss.
⑵ true myopia: also known as axial myopia, the axial diameter of the eye is prolonged, and the distant light is imaged in front of the retina after entering the eye. True myopia, vision below 0.8, myopia more than 100 degrees must wear glasses, otherwise the degree of myopia will be deeper and deeper. True myopia is that the refractive system of emmetropia is in a static state, that is, after the adjustment is removed.
⑶ mixed myopia: the state in which true and false myopia exist at the same time. Juvenile myopic students are in this state of myopia in the process of heavy learning tasks and physical development.