What is "visuall"

Usage examples of "visuall".

For making the angle of incidence equal to that of reflection, the visuall raye returneth Quincuncially, and after the form of a V, and the line of reflection being continued unto the place of vision, there ariseth a semi-decussation, which makes the object seen in a perpendicular unto itself, and as farre below the reflectent, as it is from it above.