What meridians are associated with oblique astigmatism?

What meridians are associated with oblique astigmatism?

• A. The 0 and 90 degree axes
• B. The 45 and 135 degree axes
• C. The 30 and 150 degree axes
• D. The 60 and 120 degree axes

Answer: (B)

Oblique astigmatism is characterized by the presence of two principal meridians that are not aligned with the standard horizontal (0 degrees) and vertical (90 degrees) axes. Rather, it manifests in meridians that are positioned at oblique angles to these conventional axes, specifically at 45 degrees and 135 degrees. This type of astigmatism arises when the refractive power of the lens differs between the designated axes of vision. The 45 and 135 degree meridians are considered the rule in oblique astigmatism because they create an asymmetrical distribution of refractive power that affects how light is focused on the retina, resulting in blurred vision at certain orientations of objects. In contrast to this, other combinations of meridians mentioned in the choices do not accurately capture the essence of oblique astigmatism. Hence, the 45 and 135 degree axes accurately represent the typical orientation of the principal meridians associated with this form of astigmatism.

Oblique astigmatism is characterized by the presence of two principal meridians that are not aligned with the standard horizontal (0 degrees) and vertical (90 degrees) axes. Rather, it manifests in meridians that are positioned at oblique angles to these conventional axes, specifically at 45 degrees and 135 degrees.

This type of astigmatism arises when the refractive power of the lens differs between the designated axes of vision. The 45 and 135 degree meridians are considered the rule in oblique astigmatism because they create an asymmetrical distribution of refractive power that affects how light is focused on the retina, resulting in blurred vision at certain orientations of objects.

In contrast to this, other combinations of meridians mentioned in the choices do not accurately capture the essence of oblique astigmatism. Hence, the 45 and 135 degree axes accurately represent the typical orientation of the principal meridians associated with this form of astigmatism.