PATIENT EDUCATION

Ultrasound (B scan)

It is an important aid in the clinical assessment of the eye. It helps in identifying the different pathologies with the help of ultrasound waves. It gives us gross information about the morphological nature of the eye. However, the functional status of the structures cannot be elicited by this test.

Indications:
Media opacity - In such conditions, B scan helps us in gathering better anatomical information when media opacity eludes a simple clinical examination.

  • Posterior segment pathologies through opaque media eg, dense cataract, bleeding in the eye.
  • Lens dislocation
  • Retinal detachment
  • Tumours
  • Suspected foreign body in the eye
  • Non-dilating fixed pupil, as in uveitis
  • Pupillary membrane
  • Dense cataract

In the absence of media opacity, B scan is used to gather greater information regarding the structures which are readily visible. For example –

- Differentiation of serous choroidal detachment from haemorrhagic choroidal detachment
- Differentiation of Rhegmatogenous retinal detachment from exudative retinal detachment
- Differentiation of Iris from ciliary body lesions
- Identification of a ciliary body detachment
- Differentiation of intraocular tumours

Procedure:
It is a contact procedure. The technician performs the test by placing a probe on the closed lids after placing a small quantity of gel over the lid. By asking the person to look at different directions the technician evaluates the status of various intraocular structures.

Contraindication:
As it is a contact procedure, the test is avoided in case of open globe injury of the eye.

B-scan report