What is B-scan used for?
B-scan ultrasonography (USG) is a simple, noninvasive tool for diagnosing lesions of the posterior segment of the eyeball. Common conditions such as cataract, vitreous degeneration, retinal detachment, ocular trauma, choroidal melanoma, and retinoblastoma can be accurately evaluated with this modality.
When is B-scan performed?
A B-scan is generally used to evaluate diseases involving the posterior segment (the hind two-third of the eye) and orbit, typically when the ocular media (fluids within the eye) are cloudy and a direct visualization is not possible. foreign bodies in the eye.
What does vision look like with a vitreous hemorrhage?
This impairment varies from a few ‘floaters’ and cloudiness of the vision through to the vision going completely dark (sometimes with a reddish tinge). Vitreous haemorrhage can therefore cause anything from floaters, hazy or dulled vision to complete loss of vision.
How long does it take for vitreous hemorrhage to clear?
Normally, no treatment is needed for a vitreous hemorrhage. The blood should clear by itself and your vision will be restored. Unfortunately, this may take up to several months. Your eye doctor will follow up with you and monitor this condition until it goes away.
What is the principle of B scan?
B-scan ultrasound uses high frequency soundwaves that are transmitted from a probe/transducer into the eye. As these soundwaves strike the intraocular structures, an echo is reflected back to the probe and converted into an electrical signal. This signal is then reconstructed into a two-dimensional image on a monitor.
What is the principle of B-scan?
What is the difference between a-scan and B-scan ultrasound?
A-scan ultrasound refers to a one dimensional amplitude modulation scan. B-scan ultrasound refers to a two dimensional, cross-section brightness scan. It is typically used to evaluate posterior segment and orbital pathology, particularly when the ocular media are cloudy and a direct view is not possible.
What is an A-scan for eyes?
This “A” Scan device measures the length of the eye in addition to the shape of the surface of the eye, and the dimensions of other structures in the eye. It then runs calculations using multiple different formulas to help us predict which intraocular lens implant power will provide the best outcome for the patient.
Can a contact B scan detect a vitreous hemorrhage?
Both A-scan and contact B-scan (more useful) ultrasound have a role in confirming the vitreous hemorrhage and also detecting underlying causes such as posterior vitreous detachment, retinal detachment or tear, trauma, or malignancy 1-3.
Can a slit lamp be used to diagnose vitreous hemorrhage?
Slit-lamp examination confirms the diagnosis through visualization of blood in the vitreous chamber, although may have a limited role in detecting the underlying cause if the hemorrhage is diffuse 2.
Can a vitreous hemorrhage cause orbital pain?
In traumatic cases, orbital pain may be present, although this is likely to be due to other orbital injuries rather than the vitreous hemorrhage itself 2.
What can be done about a vitreous hemorrhage?
Although spontaneous regression of the hemorrhage is seen in approximately half of all patients, the condition may require operative intervention with posterior vitrectomy 2. Treatment of the underlying cause is also paramount 2. 1.