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Astigmatism Vector Combination

Combines two cylindrical (astigmatic) powers at different axes into a single resultant cylinder and axis — e.g. combining corneal astigmatism with a surgically-induced astigmatism vector.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

Cylinder 1 PowerD

Cylinder 1 Axis°

Cylinder 2 PowerD

Cylinder 2 Axis°

Enter the values above to see the result.

Source

Naylor EJ. Astigmatic difference in oblique meridians. Br J Ophthalmol. 1968;52(5):422-425. Standard obliquely-crossed-cylinder vector combination.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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