Screen time and reduced outdoor activity during the pandemic may have lasting effects on children’s eye health, including changes in corneal curvature. Study: Prevalence and Severity of ...

After fully correcting cycloplegic refraction, the authors created with-the-rule and against-the-rule astigmatism of 1 ... from the study by using the keratoconus screening test of Placido disk ...

Purpose: Analysis of changes in corneal curvature and astigmatism after phacoemulsification for senile ... the center positioning was ≥90%, and the Placido disk coverage area was ≥80%, the inspection ...

The perpendicularity of the principal meridians of the cornea determines whether the astigmatism is regular or irregular. Considering the center of the pupil as a pole, imaginary lines are drawn ...

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A lenticular astigmatism happens when there’s a distortion in the lens. Astigmatisms are sometimes also described as regular or irregular ... a laser to create a disc-shaped piece of tissue ...

Results At 18 months, Orbscan II 3 mm, 5 mm keratometry and simulated astigmatism and cone apex power and wave ... objective and subjective refraction, Placido-disc and scanning-slit topography, ...

Two major types of topographers exist: placido disk and corneal tomography instruments ... with less than 1.00 D of astigmatism, and they do not have unusually flat corneas. I have had success with ...

Depending on the severity of astigmatism, the cornea takes the shape of an egg or a rugby ball, rather than the regular round shape. This type of astigmatism is the most common form. Lenticular ...