Bagolini Striated Glasses Test

The Bagolini striated glasses test, or BSGT, is a subjective clinical test to detect the presence or extent of binocular functions and is generally performed by an optometrist or orthoptist or ophthalmologist (medical/surgical eye doctor).

To perform the test you will need Alternatively, trial frames and lenses or a lorgnette can be used.

In some cases, the use of prisms is necessary to measure a deviation and test for the presence of binocular functions.

Apart from testing binocular functions, Bagolini striated glasses can measure cyclotropia .

The glasses are placed in the trial frames with the striations vertical, giving rise to two horizontal line images when viewing a spotlight.

The lines can be straightened subjectively by rotating the glasses in the trial frame and the degree of cyclotropia recorded.

The examiner shines a torch light, directing it towards the centre bridge of the Bagolini glasses i.e. the patients nose (light is at patients eye level) from distance (6 m) or near (33 cm).

In a patient with normal binocular functions, the expected results would be a cross with the light where the two lines intersect.

The line corresponding to the right eye will be on the left side of the results, meaning the images are crossed.