Which prescription notation indicates a diagnosis of astigmatism?

The notation indicating a diagnosis of astigmatism is characterized by the presence of both a spherical component and a cylindrical component, along with an axis measurement. In the case of the correct answer, it shows a prescription of -1.25 diopters with a cylindrical correction indicated by "x155." The number following the "x" specifies the axis or orientation of the astigmatism, which is crucial for proper lens correction.

Astigmatism occurs when the cornea or lens of the eye is irregularly shaped, leading to blurred or distorted vision. The cylindrical component of the prescription is essential for compensating for this irregularity, making it a clear indicator that the patient has astigmatism.

In contrast, the other options represent simple spherical prescriptions without any cylindrical correction or axis specification. Such prescriptions typically indicate myopia (nearsightedness) or hyperopia (farsightedness), but do not involve astigmatism, as they lack the crucial cylindrical notation that is needed to correct for the condition.