Which of the following best describes lenticular astigmatism?

Lenticular astigmatism specifically refers to the irregular curvature of the lens within the eye. Unlike corneal astigmatism, which arises from variations in the curvature of the cornea, lenticular astigmatism affects the lens. This means that the light rays are not focused evenly onto the retina due to the shape of the lens, which can result in blurred vision at all distances.

In comparison to the other options, choice A talks about irregular curvature of the cornea, which defines corneal astigmatism. Choice C suggests a combination of both corneal and lenticular irregularities, which could present in some individuals, but it does not specifically define lenticular astigmatism alone. Choice D describes a condition where both the cornea and lens have a uniform curvature, which would lead to clear vision rather than the distorted vision associated with astigmatism. Therefore, option B accurately characterizes lenticular astigmatism by emphasizing its connection to lens irregularities, making it the most precise answer.