Can the signs of disease be seen in a person's eyes?

Can the signs of disease be seen in a person's eyes?

 It is a fact that doctors can find indications of some physical diseases while examining a patient's eyes. Examination of the concave interior of the eye, for example, provides information about vascular diseases and diabetes Measuring the arteries and veins in the eye can even enable doctors to estimate a patient's risk of heart attack or stroke. The shape and size of the pupils can supply evidence about blood pressure as well as the risk of a stroke. A yellowing of the normally white eyeball may indicate jaundice.

However, iridology or iridodiagnosis - a technique used by many practitioners of complementary medicines - is not recognised by orthodox medicine. Iridology divides the iris into different sectors, each of which corresponds to a part of the body. The shape and pattern of the pigmentation in a sector is believed to indicate the presence of a disease or susceptibility to a variety of complaints.