Vitreous haemorrhage
We can assess whether there are also signs of retinal detachment or other changes.
Seeing inside the eye when clouding obscures the view
Eye ultrasound
Ultrasound shows structures inside and behind the eye when dense cataracts, corneal clouding or vitreous bleeding limit light-based tests. It complements examination for selected clinical questions.
Understanding the procedure
Sound waves instead of light.
A small probe sends high-frequency sound waves and receives their echoes. B-scan creates a two-dimensional section of the eye and orbit; A-scan measures distances and tissue properties.
The test may be performed through the closed eyelid or directly on the eye’s surface after anaesthesia. The clinical question determines the technique.
- Technology
- high frequency ultrasound
- Contact
- A probe with gel, usually placed on the eyelid
- Radiation
- No X-ray radiation
- When it is used
- Vitreous, retina and eye socket
Used where needed
When does ultrasound help?
This method is especially useful when the inside of the eye cannot be viewed directly.
Dense cataract
Before surgery, ultrasound can assess the back of the eye as far as it is accessible.
Masses in the eye socket
We can assess the size, position and internal reflections of selected changes in the eye or orbit.
Inflammation or injury
Depending on the situation, membranes, fluid and some effects of foreign bodies may be visible.
Step by step
That's how the sonography works.
The examination usually takes only a few minutes.
Agreeing the purpose of the examination
Previous findings and the examination determine which scan sections and directions of gaze are needed.
Apply gel
Contact gel is usually applied to the closed eyelid. Direct contact requires anaesthesia and a suitable probe.
Looking in different directions
You move your eye as instructed while several scan sections are recorded.
Bringing the findings together
Shape, movement and reflection patterns are interpreted alongside symptoms and the rest of the examination.
Understanding the results
Ultrasound shows anatomy – not every detail of the retina.
A detached retina, vitreous membrane or mass may have characteristic shapes and movements. Interpretation requires experience and comparison of different scan sections.
Small or shallow retinal changes, fine macular details and early vascular changes are often assessed better with OCT, angiography or a direct retinal examination.
Well prepared
How to prepare for your visit
- usually no special preparation
- Remove contact lenses before your appointment
- Avoid eye make-up as much as possible
- Bring previous imaging or surgical reports
Frequently asked questions
Clear, concise answers.
Is the ultrasound painful?
An examination through the closed eyelid usually involves only light contact. Direct examinations are performed after local anaesthetic is given.
Why is an OCT scan not enough?
OCT needs a clear optical path. With dense clouding or bleeding, ultrasound can still provide information from inside the eye.
Can any retinal detachment be excluded?
Ultrasound is valuable when the inside of the eye cannot be seen, but has limitations. Acute symptoms always require a full eye assessment.
Medical note
This page cannot replace an eye examination. Your symptoms, history and findings determine which tests are useful and how their results should be interpreted.
Medical basics
Sources and further information.
Related topics
All non-surgical eye care services