P J Carlin | PubMed Health

PubMed1995

Evolution of control system models of ocular accommodation, vergence and their interaction.

This paper reviews the evolution of inferential models describing ocular accommodation and vergence, which have been developed using the techniques of control engineering. The models are developed by inferring that the observed behaviour of the ocular systems could be produced by particular types of feedback control systems. The models are subsequently tested and improved by modifications resulting from the comparison of model predictions with physiological experimentation. Current models of accommodation and vergence have had considerable success in describing both the steady-state and dynamic behaviours of the individual systems. However, controversy currently exists among researchers, particularly with respect to the composition of models that describe the interaction of the two systems.

Accommodation, Ocular↗

PubMedDate not supplied

Testicular self-examination: a public awareness program.

Testicular cancer is responsible for one out of seven deaths among late adolescent and young adult males. It is the number one cancer killer of men in the second and third decade of life. However, the population at risk, men between the ages 15 and 35, is singularly unaware of this cancer's existence and its potential danger. A public awareness program has been designed to increase consciousness about this possibly fatal disease and to enhance early detection and cure through a program of testicular self-examination (TSE). This proposal incorporates intervention at local, State, and national levels. It contemplates an innovative campaign beginning at the local level, focusing on the target population and utilizing a collaboration between nonprofessionals and professionals. The aim is for a grass-roots beginning and continued public interest to culminate in a national campaign, similar to that of breast self-examination. The ultimate goal of the program is to prevent the loss of lives to testicular cancer through public education and through use of TSE.

Adolescent↗