Segmented delta toric lens

Abstract

A segmented delta toric lens is described. The segmented delta toric lens includes an optical area, a circumference area surrounding the optical area and a segmented delta protrusion formed on the circumference area. The segmented delta protrusion is located apart from the optical area and the edge of the circumference area. The segmented delta toric lens can further include a mark to indicate a direction of the segmented delta toric lens.

Description

technical field [0001] The present invention relates to a toric contact lens, in particular to a toric contact lens with partial protrusions. Background technique [0002] Currently, contact lenses are widely used for vision correction. Contact lenses are more convenient to use than ordinary eyeglasses, so they are more and more favored by users. [0003] Astigmatism is an eye disorder that can be corrected with contact lenses with aspherical lenses. Usually on the patient's prescription, it can be represented by a cylinder, because at least a part of the surface of the lens is elliptical. Such contact lenses are generally referred to as toric contact lenses. Today, toric lenses are used to correct the wearer's astigmatism. However, the axis angle of the contact lens must be correctly matched to the wearer's eye, that is, the top of the contact lens must be on top of the wearer's eye. With normal drop-on glasses, this is no problem because the lenses are permanently fix...

AI Technical Summary

Problems solved by technology

However, a disadvantage of these toric contact lenses is that they rely on the wearer's upper eyelid movement and contact lens thickness differences to align the axis of the toric contact lens with the wearer's eye.

As the thickness of the optical zone of this type of contact lens is increased, the contact lens becomes thicker which causes discomfort to the wearer

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