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About pantoscopic angle and wrap angle

About pantoscopic angle and wrap angle

Calculating with optical correction power of parallel thin lens systems is very easy using the concept of vergence. However, if the lenses are not parallel, but…

Peter Torma, PhD May 14, 2018
About the vertex distance

About the vertex distance

Vertex distance is the distance between the eye (front of the cornea) and the corrective lens. In most cases, it is considered zero for contact lenses. In case of…

Peter Torma, PhD May 7, 2018
Geometry of eye convergence

Geometry of eye convergence

It is well known that the pupils of the human eye moves closer to each other whenever the person is focusing on closer objects. The pupils are the farthest from…

Peter Torma, PhD April 30, 2018
The technology behind MIRA

The technology behind MIRA

The human visual system perceives 3D by combining the images received by two eyes. Copying this so-called stereo processing ability of humans has been a research…

Peter Torma, PhD April 23, 2018
Experiment on constancy of lookout points

Experiment on constancy of lookout points

Experiment It is generally believed that far PD (pupillary distancePupillary distance: The distance between the center of the pupils. Also known as PD. when…

Peter Torma, PhD April 16, 2018
How to measure PD?

How to measure PD?

Assume a patient is given the level and type of correction her eye needs and decides to use lenses for correction. The optician should then design and position lenses…

Peter Torma, PhD April 9, 2018
About Pupillary Distance (PD)

About Pupillary Distance (PD)

Pupillary distance is a distance between the centers of the pupils, which is widely considered the most basic measure in optics. The obvious motivation is that if…

Peter Torma, PhD April 2, 2018
Ars Poetica - About this blog

Ars Poetica - About this blog

We all want good glasses. It’s about our vision, one of the most important senses. Our eyewear certainly tells a lot about fashion, personality, and status, but…

Peter Torma, PhD March 26, 2018