1. An image processing device comprising: an enhancement processing means configured to enhance a speckle pattern in an ocular fundus tomographic image; a region-of-interest setting means configured to set a desired region in the ocular fundus tomographic image with the enhanced speckle pattern as a region-of-interest; a feature value extracting means configured to extract a feature value of the speckle pattern in the region-of-interest; and a disease determining means configured to make disease determination for an ocular fundus on a basis of the feature value.