Two cases of successfully treated strabismic amblyopia were examined. Later on, a slight myopia appeared in the fixating eye only, while the amblyopic eye remained practically emmetropic. The 2 patients had to wear monocular myopic correction, otherwise the visual acuity of the other eye would have been reduced below the visus (without correction) of the fixating but myopic eye. A 3rd case was reported of a hypermetropic patient with a right amblyopic eye and a left fixating but myopic eye. After the appearance of myopic lesions in the dominating eye, pleoptical treatment was successfully given to the amblyopic eye, so that in the end it turned out better than the other eye. Also, in this case the patient was quite disturbed for a long time due to the interference of the eye which was originally better. The importance of these interocular effects, both from the standpoint of practical and medical information were discussed.