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As already mentioned, a child with strabismus has a tendency to repel the image of the squinting eye in order not to see in double. This tendency can be identified by the four spots test or the Worth 4-dot test.
As already mentioned, a child with strabismus has a tendency to repel the image of the squinting eye in order not to see in double. This tendency can be identified by the four spots test or the Worth 4-dot test. This assay uses four illuminated symbols, one red, two green and one white, and a pair of glasses worn by the examinee with a red filter in one eye and one green to another.
Through the red filter, only the red and white symbols can be seen and not the green. Similarly, through the green filter only the green and white symbols can be seen and not the red.A child who repels the image of the eye with a green filter, will say that he sees two symbols (the ones he sees through the red filter), whereas if he repels the image of the eye with a red filter, he will say that he sees three symbols (the ones he sees through the green filter).
A child who sees with both eyes, and does not repel any image, will say that he sees four symbols. This test is more easily done within a small distance, but it is more sensitive if the board is in a long distance. For this reason it can be combined with operating an optotype.