A comparative study was conducted from August 2005 to May 2008, at Hospital Universiti Sains Malaysia and Hospital Raja Perempuan Zainab II, Kelantan, Malaysia. The sample size was calculated using ...

The PARK 1 ® combines a non-contact pachymeter, auto-refractometer and keratometer in one unit. In addition to the objective refraction, the keratometer values and the pachymetry can be determined ...

Objective screening requires less input from children and is faster. With objective screening, the child merely needs to focus on a device long enough to obtain a measurement. One of the most basic ...

A property of a material that changes the speed of light, computed as the ratio of the speed of light in a vacuum to the speed of light through the material. When light travels at an angle between two ...

There are different ways to investigate refraction in rectangular blocks. In this required practical activity, it is important to: make, measure and record the angles of incidence accurately using a ...

Scientists have demonstrated that negative refraction can be achieved using atomic arrays -- without the need for artificially manufactured metamaterials. Scientists have long sought to control light ...

Olympus has introduced a 40x silicone oil microscope objective, its latest innovation in silicone immersion microscope optics. The new objective fills out the company’s full line of silicone oil ...