The photokeratoscope view displays the image of placido rings ... Detecting Irregular Astigmatism or Other Abnormalities. Corneal topography, especially photokeratoscope view and tangential ...

Astigmatism ... shows a "bow tie" on corneal topography. The power of each meridian is successive as the meridians travel 180 degrees. Astigmatism that does not show symmetry or otherwise conform ...

In this column, Dr. Liang describes her technique of managing high degrees of preoperative corneal astigmatism in cataract surgery patients. Figure 2. Topography image of exam No. 2 on 3/8/2016.

Stonecipher, MD, offered an overview of and general advice for topography-guided excimer laser ablation in patients with irregular astigmatism. Image: Eamon N. Dreisbach Topography-guided laser ...

(Photo Credit: iStock/Getty Images ... It can show problems with your eye’s surface, such as swelling or scarring, or conditions such as astigmatism or diseases like keratoconus.

Another plausible mechanism for corneal astigmatism may be forces transmitted to the cornea via the sclera derived from extraocular muscle tension. In a computerized corneal topography analysis ...