Astigmatism

A 35-year-old man from Delhi presents with complaints of blurred vision at all distances and frequent headaches. He reports that his vision is clearer when he squints or tilts his head. On slit-lamp examination, the cornea appears clear with no scarring. Keratometry shows corneal curvature of 44.00 D in the horizontal meridian and 47.50 D in the vertical meridian. Retinoscopy confirms myopic astigmatism. The patient's uncorrected visual acuity is 6/18 in both eyes. Which of the following is the most appropriate initial management?

A 32-year-old male presents with complaints of blurred vision and frequent squinting, especially when viewing the whiteboard at work. He reports that his vision improves when he partially closes his eyelids (pinhole effect). On examination, visual acuity is 6/36 in both eyes, improving to 6/9 with pinhole. Retinoscopy shows +1.50 D in the horizontal meridian and +3.50 D in the vertical meridian in the right eye. Keratometry reveals 44.00 D in the horizontal meridian and 46.50 D in the vertical meridian. What is the most appropriate optical correction for this patient?

In astigmatism, the cornea or lens has different refractive powers in different meridians. Which of the following best describes the optical defect in regular astigmatism?

In astigmatism, the cornea or lens has different refractive powers in different meridians. Which of the following best describes the optical axis along which the maximum refractive power occurs in astigmatism?

A patient has astigmatism with the vertical meridian being steeper than the horizontal meridian. According to standard nomenclature, this type of astigmatism would be classified as which of the following?