The histological comparison of the effect of 50mW green and blue laser on the human eye at variable time intervals: an animal model.

Objective: To compare the effects of 50mW green and blue laser pointers on retinal tissue with different exposure durations.

Methods: The experimental, histopathological study was conducted from November 2021 to April 2022 at the Postgraduate Laboratory of the Department of Physiology and Medical Physics, College of Medicine, Mustansiriyah University, Iraq, and comprised adult male mice. They were divided into green group G and blue group B.

Histological assessment of the effect of 50mW red laser on retina at variable time intervals: animal model.

Objective: To assess the histopathological effect of 50milliWatt red laser pointer on mice retinal tissue at variable exposure times.

Methods: The experimental study was conducted in the Postgraduate Laboratory of the Unit of Medical Physics, Department of Physiology, College of Medicine, Mustansiriyah University, Baghdad, Iraq, from November 2020 to April 2021, and comprised albino mice. Histopathological effects on the retinal tissues were evaluated microscopically using conventional haematoxylin and eosin stain just after being exposed to commercially available 50 milliWatt red laser pointers with 630nm wavelength at 1, 2 and 3 minutes, grouped as R1, R2 and R3, respectively.

Design and manufacturing of a head mask for fixation in stereotactic radiosurgery by the Gamma Knife Icon™.

Background: This study evaluates an alternative to the classical method of head fixation during Gamma Knife radiosurgery using a Leksell head frame. In the Gamma Knife Icon™ model, a new method of head fixation is used by utilizing a thermal molded polymer mask that takes the shape of the patient's head before fixing the head to the table. However, this mask is for single use and quite expensive.