The patient is automatically moved head first into the CT gantry, and the x-ray tomogram is acquired. Now the patient is automatically moved through the PET gantry, which is mounted in parallel with the CT gantry, and the PET slices are acquired. The patient may now leave the device, and the PET-CT software starts reconstructing and aligning the PET and CT images.
Diagnostic Procedures. Three common diagnostic procedures, tonometry, visual field tests, and ophthalmoscopy, enable ophthalmologists to screen patients for glaucoma. To make a definitive diagnosis, ophthalmologists often use all 3 procedures as part of an overall eye examination. The procedures are simple, relatively quick, and virtually painless.
Medical Treatment. An ophthalmologist must treat angle-closure glaucoma with either laser therapy or surgical therapy (see Surgery). 1  A laser iridotomy is the most commonly performed procedure. 2  During a laser iridotomy, your eye doctor uses a laser beam to make a hole in the iris to reduce the pressure inside the eye.ramatic symptoms of acute angle-closure glaucoma include the following: 1  Severe eye pain. 2  Nausea and vomiting. 3  Headache. 4  Blurred vision and/or seeing haloes around lights (Haloes and blurred vision occur because the cornea is swollen.). 5  Profuse tearing.