Which lens design is least likely to provide good visual results for a prescription of -2.50+1.50X90?

A soft spherical lens is not ideal for a prescription that includes astigmatism, as indicated by the +1.50X90 component. This specific prescription suggests that the patient has a cylinder power of +1.50 at an axis of 90 degrees, which means there is a significant degree of astigmatism present.

Soft spherical lenses focus light uniformly across the surface, which is usually effective for correcting myopia or hyperopia but lacks the necessary components to correct astigmatism adequately. The absence of a toric design in a soft spherical lens leads to blurred vision in astigmatic patients since the lens fails to account for the inequality in curvature that astigmatism introduces.

In contrast, soft toric lenses are specifically designed to address astigmatism and would provide better visual results for this prescription. Spherical gas permeable lenses may also be suitable, as they can sometimes correct for astigmatism to an extent. Aspheric gas permeable lenses can provide enhanced vision for those with varying degrees of astigmatism and are designed to reduce distortions from peripheral vision.

While a soft spherical lens might be comfortable to wear, it ultimately would not correct the visual acuity issues presented by the combination of my