The science of iridology can be defined as a method of diagnosis of the state of health of a subject.

In order to know the disorders in the human organism which are projected in the irises and pupils the following must be known:
- The Projection Rules.
- The topographic projection areas.
- The information which the signs convey.

Without this knowledge it is not possible to understand iridology or to make progress in its study. These three concepts are the basis and fundament of Multiple Reflex Iridology. Throughout the study extensive evidence is presented which leaves no doubt as to the truth of what we state.

The science of iridology shows:
- A state of good health, by the absence of signs or by the phase in which the signs are seen to be. The signs which do not reflect organic or system disorder are in regression, or not active.
- The loss or lack of health due to the presence of active signs.
The signs which are projected in the irises or pupils are the units of information. The information given by a sign is conveyed by its location, type, shape, size and colour.

The location of the signs, their type, shape, size and colour are the language used by the iridian system to tell us which part of the body is affected and the type and degree of the disorder.

A disorder in any part or function of our organism which causes the corresponding symptoms can be seen in the iris or pupils in the corresponding topographic projection area by one or more signs.
M.R.I reveals that., in many cases, there are other disorders in parts or functions of the organism which do not cause clear symptoms which are reflected by the corresponding sign or signs.

These asymptomatic disorders, marked by the corresponding signs, in some cases have an impact on the origin or development of the disorder which produces the symptoms.

In other cases, the asymptomatic disorders, marked by the corresponding sign or signs, have not influenced the origin or development of the disorder which produces the symptoms.

What we have just stated is clarified by means of examples and illustrations throughout the “Multiple Reflex Iridology Course”.

The classification of the disorders in the human organism and the names given to the disorders included in the study are based on the information transmitted by the signs.