This issue at a glance

In this presentation “A comparative study on visual and optical performance of Akreos AO and Kontur AB IOLs, after phacoemulsification cataract surgery”, Gharaee H et al have evaluated the visual performances by comparing two aspheric intraocular lenses (IOL). They indicate that with age positive spherical aberration increases, and consequently mesopic contrast sensitivity decreases and in such condition application of spheric IOL would aggravate the positive spherical aberration and mesopic contrast sensitivity. In this randomized, comparative, interventional investigation 35 aged patients (mean-age 1⁄4 60.97 ± 7.00 years) have been selected. Randomly, in one eye Akreos AO and in the second eye Kontur AB IOLs has been placed, following phacoemulsification. They indicate that although the visual acuity and photopic, mesopic contrast sensitivity, and aberrometric factors were not significantly different between two lenses but aberrometric and contrast sensitivity were somehow more in favor for Akreos AO. Zarei-Ghanavati S and coauthors present “Stereoacuity after photorefractive keratectomy in myopia”. Stereopsis is one of the visual functions caused by different position of the image on the brain, binocular disparity. In this prospective interventional case series 48 myopic patients who underwent successful photorefractive keratectomy (PRK) were investigated. The stereoscopic vision was taken by TNO test charts preoperatively and at 3 and 6 months postoperatively. Before the surgery the stereoscopic vision was 246.56 ± 98.43 s of arc and postoperatively at 3 and 6 months 365.38 þ 112.65 s of arc and 343.51 ± 88.96 s of arc was recorded, respectively. The stereoscopic vision was significantly deteriorated (p < 0.001) after PRK, even though the vision was significantly improved without correction. Hashemi H and colleagues present “Pentacam top indices for diagnosing subclinical and definite keratoconus”. Keratoconus (KC) often starts at the age of puberty, and corneal cross-linkage is particularly effective at early development stage of KC. In this investigation the authors have tried to find out the best methods and indices for diagnoses of KC at different stages of the disease. They evaluated 262 keratoconic cases and compared with 97 healthy individuals (control