You're dead on. The purpose for the micro-saccades is to keep the image on the retina changing. Photoreceptors on the retina do not respond to the intensity of

You're dead on. The purpose for the micro-saccades is to keep the image on the retina changing. Photoreceptors on the retina do not respond to the intensity of light, but rather the rate of change of intensity. A combination of micro-saccades and blinking lets your visual system gather as much information as it can, and visual memory fills in the gaps. The illusion of a complete image is really one of the most remarkable things about the visual system.