In keratometry notation Ks 43/43.50 @ 090, what does the axis value specify?

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Multiple Choice

In keratometry notation Ks 43/43.50 @ 090, what does the axis value specify?

Explanation:
In keratometry, you get the cornea’s powers along the two principal meridians, and the axis tells you the direction of the meridian those readings correspond to. When you see Ks 43/43.50 @ 090, the two keratometric values are the powers along the two perpendicular meridians, and the axis 090 indicates that these readings are for the meridian at 90 degrees—that is, the vertical meridian. The other principal meridian would be perpendicular to that, at 180 degrees. This axis information is important because it sets the orientation of the corneal astigmatism and helps when aligning toric lenses or interpreting the cylindrical component.

In keratometry, you get the cornea’s powers along the two principal meridians, and the axis tells you the direction of the meridian those readings correspond to. When you see Ks 43/43.50 @ 090, the two keratometric values are the powers along the two perpendicular meridians, and the axis 090 indicates that these readings are for the meridian at 90 degrees—that is, the vertical meridian. The other principal meridian would be perpendicular to that, at 180 degrees. This axis information is important because it sets the orientation of the corneal astigmatism and helps when aligning toric lenses or interpreting the cylindrical component.

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