Posterior vitreous detachment is the separation of the vitreous cortex from the retina and is likely to occur in those with vitreous liquefaction. Vitreous liquefaction tends to increase with age. 5% of people aged 21-40 years have vitreous liquefaction, about 50% of people aged 40-49 years have vitreous liquefaction, and the incidence of vitreous liquefaction in people aged 60 years or older is over 80%. It is believed that vitreous liquefaction can occur at the age of 4 years. The clinical manifestations are mainly miosis and posterior vitreous detachment.
Causes 1.Western medicine etiology The unliquefied colloidal vitreous is slightly heavier than the aqueous liquid, when the liquid cavity moves to the posterior retina, the colloidal vitreous sinks and moves forward, resulting in the complete separation of the posterior vitreous cortex from the retina, forming vitreous detachment.
2, Chinese medicine etiology and pathogenesis Mostly due to liver and kidney deficiency, deficiency of qi and blood, the pupil loses the moistening of the essence of the internal organs; or weakness of the spleen and stomach, lack of qi and blood, lack of sources of eye care; or eye trauma, damage to the veins and collaterals.
Self-perceived symptoms: dark shadows or ring-shaped dark shadows in front of the eyes; symptoms increase when the eyes are turned; or a sense of flashing light.
Early retinal detachment can be detected by fundus examination in hospital, and the retina of the lesioned area can be found to be grayish-white elevated, or a fissure can be found.
2.Physiological mosquito flying Patients usually have no other pathological signs, except for the feeling of black shadows floating in front of their eyes.
Ocular ultrasound or color Doppler ultrasound examination can understand the situation of posterior vitreous detachment.