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The effect of varying the contrast on the apparent convergence is measured for both the Café Wall and the Hollow Squares (Taylor-Woodhouse) illusions. The apparent convergence is dependent on the contrast, and also on the size of the stimulus, and varies in the same way for both illusions. This strengthens the argument that the illusions are not independent, as Taylor and Woodhouse originally claimed. McCourt has discussed brightness induction as a basis of the Café Wall illusion. Consideration of this theory leads to some interesting examples of interactions of the two illusions, and to a further, very strong, variation of the illusion in a real-life situation.

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A deuteranomalous male was filled with an X‐chrom tens in his non‐Dominant eye. The effect of wearing this lens on subsequent colour Vision classification as shown by a number of different test is described.