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.
At your routine exam, the doctor will assess the overall health and function of your eyes. The sharpness of your vision will be checked with visual acuity tests. A pressure test checks for glaucoma. The doctor may dilate your eyes using drops to get a better view of the internal structures of your eye. If you have been dilated, you should not expose your eyes to bright light for a few hours after the exam until the effects of the drops wear off. Frequency of Comprehensive Eye Exams.