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Cross cylinder correction. This approach collapses the Sturm's interval by approximating both focal lines symmetrically without disturbing the position of the CLC.
Source publication
The approach to any refractive condition of the eye with regular astigmatism is more complicated than that for myopia or hyperopia alone. It requires familiarity with the complex images collectively identified as Sturm's conoid. Fortunately, only three of those play a critical role in the interpretation of ametropia with astigmatism. This manuscrip...
Context in source publication
Context 1
... is the reason the spherical equivalent -the spherical lens that puts the CLC on the retina -is so popular among those who deal with astigmatism in eyeglasses, contact lenses, corneal topography, cataract surgery, refractive surgeries, and crosslinking. In theory, placing the CLC on the retina is the best option available to improve vision after deciding to leave astigmatism unchanged (4) (Figure 3). ...
Similar publications
Pateras Evangelos, Kazakidou Chrisi. Prevalence and distribution of refractive errors among adults in Athens-Greece (urban area). Opth Clin Ther. 2020;4(2):2-7. The purpose of this research is to acquire a clear image about the distribution of refractive errors in Greece and more specific in Athens urban area. To calculate the type and rate of refr...
Citations
... [9] The center of least confusion is referred to as the "center of the conoid of Sturm." [10] Astigmatism can be divided into the following five types, which are based on the location of the foci: Astigmatism can also be categorized based on the following causes (i.e., the refractive media): ...
This activity reviews the Jackson cross cylinder as an instrument of refraction. It also describes
the condition of astigmatism, its causes, and optical principles. The procedures and techniques
involved in refining the cylinder powers and axes during refraction using the Jackson cross
cylinder are considered. The conoid-of-Sturm and its importance to subjective refraction are also
explained. This activity highlights the Jackson crossed-cylinder and touches on the role of the
interprofessional team in managing patients with astigmatism.
