anemia
Introduction
Introduction to no tears No tears due to inferior lacrimal gland development, or due to the acquired autoimmune system disorders, disrupting the secretion of lacrimal glands, leading to tears and tears. No tears, an eye disease that cannot be cured, patients can only rely on medicated ointment to improve symptoms, or use special moisturizing glasses to avoid evaporation of water. basic knowledge The proportion of sickness: 0.02%-0.07% Susceptible people: no special people Mode of infection: non-infectious Complications: dacryocystitis
Cause
No cause of tears
Congenital causes (35%):
The congenital body is deficient in development, and the lacrimal gland is underdeveloped, resulting in no tears.
Acquired causes (40%):
The acquired autoimmune system is dysfunctional, destroying the secretion of the lacrimal gland, leading to the situation of crying and tears.
No tears, an eye disease that cannot be cured, patients can only rely on medicated ointment to improve symptoms, or use special moisturizing glasses to avoid evaporation of water.
Prevention
No tear prevention
Preventive measures include avoiding the marriage of close relatives, conducting genetic counseling, genetic testing of carriers, prenatal diagnosis and selective abortion to prevent the birth of children.
Complication
No tear complications Complications, lacrimal sac, lacrimal gland secretion, dysfunction
Dacryocystitis, lacrimal gland secretion decreased.
Symptom
No tears symptoms common symptoms lacrimal duct obstruction corneal sensation reduces lacrimal gland undeveloped
No tears or less tears.
Examine
No tears check
Ophthalmic imaging examination:
(1) Eye ultrasound: including type A ultrasound, type B ultrasound, and color Doppler imaging (CDI).
(2) Electronic computer tomography (CT examination).
(3) Magnetic resonance imaging (MRI).
(4) Ophthalmic computer image analysis: mainly includes corneal topography, corneal endoscopy, interference optical tomography (OCT) and the like.
Diagnosis
Diagnostic identification without tears
No tears due to inferior lacrimal gland development, or due to the acquired autoimmune system disorders, disrupting the secretion of lacrimal glands, leading to tears and tears. No tears, an eye disease that cannot be cured, patients can only rely on medicated ointment to improve symptoms, or use special moisturizing glasses to avoid evaporation of water. Should be identified with the following diseases:
Tracheal obstruction: the upper lacrimal duct obstruction, very common, usually occurs in the medial segment of the lacrimal canal into the lacrimal sac or the tear duct.
Obstruction of the lacrimal sac and nasolacrimal duct: most commonly occurs in the area where the lacrimal sac is connected to the nasolacrimal duct, and the lesion extends throughout most or all of the nasolacrimal duct. The reasons are: congenital malformation, mainly occurs in the lower mouth of the nasolacrimal duct; trauma; dacryocystitis or inflammation around the lacrimal sac; tumor around the lacrimal sac or lacrimal sac; foreign body; obstruction of the nasolacrimal duct; scar after nasal surgery.
Obstruction of the punctum: it can be congenital or due to the formation of scar tissue after trauma, burns or inflammation. Polyps are a common cause of tears. Polyps are like a small cover that partially or completely covers the puncture. The polyps have a pedicle. The pedicle is connected to the opening of the punctum. A bundle of blood vessels enters the polyp, such as pushing the polyp to flush the lacrimal passage. unobstructed.
