Ultrasound uses sound waves to image the back of the eye. This is especially useful when the view is obscured for some reason, such as a vitreous hemorrhage or inflammatory uveitis.
In this circumstance, the general configuration of the retina can be determined, even if the retina is detached in some location or if there is a foreign body present. Treatment options (such as surgery) can therefore be guided by ophthalmic ultrasounds.
This technology is also useful in differentiating and monitoring different types of intraocular tumors.