This approach was first proposed by George Engel in 1977. It takes a look at a broader and whole view of a patient as it tends to ascertain how biological, psychological and social factors are interconnected in affecting the health of an individual. It is usually employed in Health psychology in dealing with disorders in patients.
Professor McIntosh’s emphasis that depression often involves the interactive influences of self-focused thinking (Psychological factor), rejection from others (social factor), and low serotonin levels (biological factor) clearly illustrates a biopsychosocial approach.
Explanation:the optic nerve is a cable -like grouping of nerve fibers it connect and transmits visual information from the eye to the brain. In human eye it receives light signal from about 125million photoreceptor cells referred to as rods and cones through 2 intermediate neuron types , bipolar and amacrine cells.