| 摘要 |
The lens of the subject corrective eyeglasses obstructs the vision of a preselected area but not the whole of the wearer's stronger eye, either by impairing his vision or entirely blocking it. When the vision is so obstructed, the wearer's weaker eye is forced to compensate for the stronger eye's loss by taking over the area of sight not visible by the stronger eye. The lens may be obstructed by applying over the preselected area of the lens a coating which distorts or blurs the object seen by the eye. Alternatively an opaque coating may be applied to the preselected area to entirely block the object. In either case, the wearer is forced to use his weaker eye to see the object impaired or blocked by the coating.
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