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164 Ophthalmic Lenses

Fig. 11.43: The information displayed on the screen

Fig. 11.44: Studies show that the head-eye movement ratio directly influences
the area of the lens that is used by the wearer

The eye mover uses more of the surface of the lens, so they need a larger
acuity zone. For them the harder design as shown in the Figure 11. 45 can
be more useful. On the other hand the “head-mover”, having more dynamic
vision, will be more influenced by the periphery of the lens as their head
moves in their visual world and will be benefited from the peripheral
“softness” as shown in the Figure 11. 45. Each Varilux Ipseo lens is designed