Patent ID: 7489333

Claim:
An ophthalmologic image pickup apparatus which picks up an image of a fluorescence of a fluorescent agent in a fundus of an eye of a person to be examined after injecting the fluorescent agent into a vein of the person, comprising: an observation illumination light source for illuminating the eye of the person when the eye is observed; an image pickup illumination light source for illuminating the eye of the person when an image of the eye is picked up; timer means for measuring an elapsed time from injection of the fluorescent agent into the vein of the person; image pickup means for picking up the image of the eye; illuminance detecting means for detecting an illiminance value of the eye from at least one of an image signal from the image pickup means and an amplifying ratio of the image pickup means; and calculation means for calculating a predicting formula: α×β −γ(t−τ) used for predicting a variation of the illuminance value of the eye in accordance with the elapsed time after stopping illumination of the eye by the observation illumination light source, on a basis of a relation between the elapsed time and the illuminance value of the eye during observation of the eye, wherein t is the elapsed time, and wherein α, β, γ, and τ are arbitrary constants obtained from experimental values; and exposure control means for determining at least one of a light intensity of the image pickup illumination light source and the amplifying ratio of the image pickup means at a time when the image pickup illumination light source emits after stopping the illumination of the eye by the observation illumination light source, on a basis of the calculated predicting formula.