Such motion is usually first detected in their periphery, where they have poor visual acuity, and horses will usually act defensive and run if something suddenly moves into their peripheral field of vision.
12.
Generally, the peripheral field of a diving mask is improved if the lenses are as close to the eye as possible, or if the lenses are large, multi-window, or is a curved wrap-around design.
13.
Furthermore, Marx argues that the introduction of machinery may increase employment in other industries, yet this expansion " has nothing in common with the so-called theory of compensation . " Greater productivity will necessarily generate an expansion of production into peripheral fields that provide raw materials.
