Simplifying and understanding various topographic indices fo ... | 合法醫療器材資訊網

由KDoctor著作·2020·被引用1次—4)Indexofsurfacevariance(ISV)ismeasuredasthestandarddeviationofindividualsagittalradiifrommeancurvature.Itisanindicatorofcornealsurface ...

Keratoconus (KC) is a progressive ectatic corneal disorder affecting mainly the adolescent age group.[1] A thorough slit-lamp examination supplemented with retinoscopy, detailed documentation of refractive error, and corneal topography helps in the diagnosis of KC. In early cases of keratoconus, the classical slit-lamp signs may not be visible in early stages and hence corneal topography is the most reliable diagnostic tool.[23]

In 1980s, the placido disk-based corneal topography devices were introduced that helped in diagnosing the condition, even before the clinical signs were appreciated on the slit lamp. It further paved way for the technological advancement in the diagnostic devices for KC.[4] These devices are based on the principle of projection and a series of illuminated mires are projected onto the cornea to capture the scans.[5] It calculates corneal curvature depending ...