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The Worth Four Light Test, also known as the Worth's four dot test or W4LT, is a clinical test mainly used for assessing a patient's degree of binocular vision and binocular single vision. Binocular vision involves an image being projected by each eye simultaneously into an area in space and being fused into a single image.
The test determines whether the patient has bifoveal fixation or monofixation despite their eyes seeming straight. [ 2 ] On the cover component of cover test a small manifest deviation may be documented, however the patient passes the Worth's Four Lights Test or Bagolini Striated Glasses Test , indicating binocular single vision, but fails a ...
To perform the test you will need Bagolini Striated Glasses; Pen torch or a distant light source. 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.
There are different targets a patient can fixate on during the test. They are chosen on the basis of the patient's conditions. [12] Central target: Yellow light in the bowl's centre; Small diamond: For patients who cannot see the central target such as those with macular degeneration. The patient looks into the centre of the four lights
The patient indicates whether he sees the light by pushing a button. The use of a white background and lights of incremental brightness is called "white-on-white" perimetry. This type of perimetry is the most commonly used in clinical practice, and in research trials where loss of visual field must be measured. [4]
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