Anterior chamber depth measurement

Anterior chamber depth measurement is important in ophthalmology clinically. The anatomical basis of the incidence of angle-closure glaucoma is shallow anterior chamber, narrow angle of the anterior chamber, and disproportionate enlargement of the lens. Therefore, the measurement of the axial depth of the anterior chamber is very important in the early diagnosis of the angle-closure glaucoma and the estimation of the course of disease progression. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Don't be angry and anxious and the spirit is stimulated. Normal value Observe the distance between the posterior wall of the cornea and the most peripheral part of the iris surface, that is, the "peripheral anterior chamber depth", where the corneal thickness (CK) is calculated, which corresponds to a "corneal thickness", which is 1CK; >2/3CK is the normal range; ≤1/5CK is the pathological phenomenon. Clinical significance Abnormal results Glaucoma has a rapid onset, which is characterized by severe pain in the head of the eye, eye congestion, and typical symptoms of sudden drop in vision. The pain is radiated around the eyelids, sinuses, ear roots, teeth, etc. in the area of ​​the trigeminal nerve; the intraocular pressure rises rapidly, the eyeball is hard, often causing nausea, vomiting, sweating, etc.; the patient sees a color halo or image around the incandescent lamp. After the rain, the rainbow is a rainbow phenomenon. Need to check the eyes of people with severe pain, glaucoma patients. Precautions Taboo before the test: avoid angry and anxious and mentally irritated. Requirements for inspection: Keep breathing gently and cooperate with the doctor. Inspection process (1) The patient's head is fixed to the slit lamp bracket and looks at the front. (2) The slit light is narrowed as much as possible, and the cornea is approximately perpendicular to the peripheral cornea. (3) The measurement site is located at the temporal corneal margin of the temporal side and the iris is about to disappear. (4) Adjust the corneal microscope to a 60° angle to the slit lamp and observe the distance between the inner wall of the cornea and the peripheral portion of the iris. Not suitable for the crowd Inappropriate population: no family history or no history of glaucoma.