By fully raising the rheostat of the slit lamp, you can better see the old vitreous. It helps for the patient to look up and then return to the straight fixation. With the lighting on, you'll see the vitreous in motion, September 13, 2002.Indications for vitreous examination with a slit lamp include symptoms of flying flies and flashes of light, for diagnosing subsequent vitreous detachment with or without retinal complications, and for evaluating vitreous involvement in the intraocular inflammation of the segment. In addition, the collapse of the rear boundary layer of the vitreous in the rear vitreous detachment (PVD) can easily be overlooked if the slit lamp does not focus well on the rear chamber.
To do this, a Volk lens (or similar) is used to view the optic disc, and then the slit lamp is moved away from the patient to blur the retina and observe the rear vitreous base. A dynamic technique To observe the anterior vitreous, the patient's pupil dilates and sits on the slit lamp.