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The purpose of the present study was to evaluate subjectively by third persons the features of mandibular prognathism patients before and after surgical correction. Eye movement of the 30 third persons (15 males and 15 females) was measured by the cornea reflection method when shown face photographs of three mandibular prognathism patients as typical examples taken before and after surgical correction by the Obwegeser-Dal Pont method. Each photograph was presented for 5 seconds.The results were as follows:1. In two cases the total number of vision fixations showed little difference between the pre-operative face (Pre op.) and post-operative face (Post op.), but one case showed a downward trend in the Post op. Total duration of fixation and ratio of total duration of fixation to total number of fixations showed an upward trend in the Post op. compared with the Pre op. in all cases.2. As to locations of the first, second and third fixation points, fixation tended to be earlier to the lip and the mandibular areas in the Pre op. than the Post op.3. The 5-second presentation time was divided into 5 parts of 1 second each. In each part the duration of fixation at the lip area in the Pre op. was longer than in the Post op.4. The latent time for fixation (time for first fixation at each area) at the eye and nose areas tended to shorter in the Post op. than the Pre op., but at the lip and mandibular areas it tended to be longer in the Post op. than the Pre op.5. The number of fixations and the duration of fixation at the lip and mandibular areas showed greater reduction in the Post op. than the Pre op. At the eye area however they increased in the Post op. more than the Pre op., and at the nose area they showed little change. The difference in the number of fixations and the duration of fixation at the lip and mandibular areas between the Pre op. and Post op. tended to increase as the amount of mandibular backward positioning increased.These results suggest the benefits of eye movement measurements in the evaluation of the features of mandibular prognathism patients before and after surgical correction.

Evaluation of the facial features of mandibular prognathism patients before and after surgical correction by measuring the eye movement of observers.