Certainly, the iris color can change for various reaons. Just as poisoining and tissue erosion in the body can affect the color, so can cleansing the body. And as you may know, people with multiple personalities can change their iris color from blue to brown or green to gray with in a split second, depending on who is the dominating personality or soul fracture at that time. Gradual personality changes can also change the eye color. The old viewpoint that things in our body are and static or physical and, therefore, real, is defying the laws of quantum physics and are just figments of our imagination. Our body can change and heal in a heartbeat, but doubt and old programming often prevents us from allowing such changes. Again, some people with multi-personalities can have diabetes or an allergy in one state of awareness, and the next moment they don't have these in another state of awareness. Conventional medicine doesn't like to disscuss these phenomena, because this would upset the entire theory that the body cannot heal itself, at least not from one second to the next. The truth is, with a different program, attitude, and self-perception that is not just in the head but in the heart, the body, eyes, hair, bones, skin, etc. can be altered. The main problem is that most people don't change their programs. They think and do the same way they thought and acted yesterday, and the day before, and the day before. It's the same old record playing. Improving one's diet requires an attitude change to life and onself. This changed, more loving attitude has a greater healing effect on the body than the healthier food. It is called spontanous healing. Many cancer patients experience a spontaneous remission when they undergo a sudden inner transformation, not dissimilar to what happens in personality disorders. So be open to changes in the body.
Yes, dark spots in the iris relate to past accumulation of waste deposits, and whites in different parts of the iris to acidification of tissues; white rings on the periphery of the iris relate lymphatic congestion or protein and cholesterol accumulating in the blood vessel walls. But it is best not to over-analyse these changes and better create a good outlook for yourself. Otherwise, you will just be using an old program and play the same old record over and over. Not much progress or healing can come of that.