The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . linder with a minus sphere and a plus cylinder,but the importance of having
Astigmatism 1122020 1 Definition Astigmatism is defined as
Astigmatism and the analysis of its surgical correction | British Journal of Ophthalmology
The refraction of the eye; including a complete treatise on ophthalmometry; . o. 1, 5^ to 12 inches. This last glass was ordered as a sphero-cylinder (plus spherewith a minus cylinder).