A NOTE ON EYE-STRAIN.

A Note on Eye Movement

In a simplified fashion, the motion of the eyeball in its orbit consists of rotations around a fixed point. Therefore, this motion can be described in terms of the Euler’s angles of rigid body dynamics. However, there is a physiological constraint in the motion of the eye which reduces to two its degrees of freedom, so that one of Euler’s angles is not an independent variable. This paper review...

Eye Strain

He says : With the parts thus rendered specially receptive to infective germs there is little difficulty in understanding that inflammations should ensue, and thus we find that blepharitis, corneal ulcers, phlyctsenulse, iritis, cyclitis, and glaucoma may have eye strain as one of the predisposing causes. There is also little doubt that cataract may be started by the irregular contraction of th...

Note on the Typhoon Eye Trajectory

We consider a simplified model of typhoon based on the two-dimensional Navier-Stokes barotropic equations. Exact solutions with linear profile of velocity to these equations are found. We describe the qualitative behaviour of the vortex and possible trajectories of the typhoon eye. 1 Preliminaries The typhoon (or tropical hurricane) is a vortex of middle-scale in the atmosphere. It is a rather ...

Eye Strain and Convergence

A note on vague graphs

In this paper, we introduce the notions of product vague graph, balanced product vague graph, irregularity and total irregularity of any irregular vague graphs and some results are presented. Also, density and balanced irregular vague graphs are discussed and some of their properties are established. Finally we give an application of vague digraphs.