The term refers to a specific lens design crafted to correct astigmatism. Astigmatism occurs when the cornea or lens of the eye has an irregular curvature, causing blurred or distorted vision at all distances. The lenses used to correct this condition have different powers in different meridians, allowing them to compensate for the eye’s uneven shape. Imagine a basketball being perfectly round, whereas an eye with astigmatism is shaped more like a football; this lens corrects for that “football” shape.
Correcting astigmatism is important for achieving optimal visual acuity and comfort. Individuals experiencing blurred vision due to astigmatism can benefit significantly from these specialized lenses. Historically, correcting astigmatism was more complex; the development of these lenses made it more practical and accessible. The benefit extends beyond merely seeing clearly; it can reduce eye strain, headaches, and improve overall quality of life for those affected.