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Contact SupplierCross cylinder examination (otherwise known as Jackson's cross cylinder) is an examination used for the final fine-tuning of the axis and strength of astigmatism after its determination through retinoscopy, stellate cycle or automatic refractometry. With the advent of technology, techniques like retinoscopy and cross cylinder examination might seem outdated and useful only to the personnel of humanitarian missions. They do however provide an accurate alternative and their use gives a thorough understanding of the principles of refraction.