A method for dynamically evaluating a tear fluid layer using an interference fringe image of the tear fluid layer composed of a plurality of consecutive frames, the method comprising: an image creation step of creating at least one break detection image of a first break detection image, a second break detection image, a third break detection image, and a fourth break detection image, which are images for detecting a breaking site of the tear fluid layer; a determination step of determining whether the break detection image created by the image creation step corresponds to a predetermined breakup pattern; a tally step of tallying the determination results determined by the determination step; and an evaluation step of evaluating, on a basis of a tallied result by the tally step, a breakup pattern of the interference fringe image of the tear fluid layer, characterized in that said determination step is effected in each frame; the evaluation step corresponds to any one of following (a) to (b), (a) the evaluation step is to evaluate a most frequent breakup pattern as the breakup pattern of the interference fringe image of the tear fluid layer on a basis of the tallied result by the tally step, or (b) the evaluation step evaluates the breakup pattern of the interference fringe image of the tear fluid layer through comparison between an appearance ratio of the breakup pattern to a total number of target frames and a threshold value on a basis of the tallied result by the tally step. an image creation step of creating at least one break detection image of a first break detection image, a second break detection image, a third break detection image, and a fourth break detection image, which are images for detecting a breaking site of the tear fluid layer; a determination step of determining whether the break detection image created by the image creation step corresponds to a predetermined breakup pattern; a tally step of tallying the determination results determined by the determination step; and an evaluation step of evaluating, on a basis of a tallied result by the tally step, a breakup pattern of the interference fringe image of the tear fluid layer, characterized in that said determination step is effected in each frame; the evaluation step corresponds to any one of following (a) to (b), (a) the evaluation step is to evaluate a most frequent breakup pattern as the breakup pattern of the interference fringe image of the tear fluid layer on a basis of the tallied result by the tally step, or (b) the evaluation step evaluates the breakup pattern of the interference fringe image of the tear fluid layer through comparison between an appearance ratio of the breakup pattern to a total number of target frames and a threshold value on a basis of the tallied result by the tally step. (a) the evaluation step is to evaluate a most frequent breakup pattern as the breakup pattern of the interference fringe image of the tear fluid layer on a basis of the tallied result by the tally step, or (b) the evaluation step evaluates the breakup pattern of the interference fringe image of the tear fluid layer through comparison between an appearance ratio of the breakup pattern to a total number of target frames and a threshold value on a basis of the tallied result by the tally step. <EOS>