Test influence of screen thickness on double-N six-light-screen sky screen target

The hess screen test.

The Hess screen test was designed by Walter Rudolf Hess in 1908 with subsequent modifications.(1, 2) Hess was a famous neurophysiologist who was awarded the Nobel Prize in 1949 for his research into the functional organization of the vegetative nervous system.(3, 4) The original test used a black screen on which was marked a square-meter tangent scale. The tangent nature of the coordinate lines...

Visual Screen: Transforming an Ordinary Screen into a Touch Screen

Touch screens are very convenient because one can directly point to where it is interesting. This paper presents an inexpensive technique to transform an ordinary screen into a touch screen using an ordinary camera. The setup is easy: position a camera so it can see the whole screen. The system calibration involves the detection of the screen region in the image. which determines the projective...

Fresnel Prism on Hess Screen Test

A 65-year-old male patient complained of diplopia after a cataract surgery. He had esotropia of 18 prism diopters (PDs) at distant and near deviation, and therefore, we performed the Hess screen test to identify any abnormal eye movement. However, the indicator was found to be out of bounds, and therefore, the test could not be completed. Therefore, the test was subsequently performed with a 20...

A Comparison of the effectiveness of Mammographic Film-Screen and Standard Film-Screen in the Detection of Small Bone Fractures

The use of mammography film-screen is limited in general radiography. The purpose of this study was to compare the effectiveness of mammographic film-screen and standard film-screen systems in the detection of small bone fractures. Radiographs were taken from patients' extremities and neck areas using mammography film-screen and standard film-screen (n=57 each). Fourteen other radiographs were ...

کنترل شن توسط Expandable Sand Screen