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Faculty of Science, Engineering and Computing.
Penrhyn Road
Kingston upon Thames
Surrey KT1 2EE

Tel: +44 (0)20 8417 9000

Dr Mehdi Bahrami

School/Department: Faculty Wide
Position: Post-Doctoral Research Fellow in Applied Optics

Educational and Professional Qualifications

  • 2009 - 2012 PhD in Optical Design, National University of Ireland, Galway
  • 2006 - 2009 MSc in Atomic and Molecular Physics
  • 2002 - 2006 BSc in Solid State Physics

Research Interests

The contribution of refractive index to optical quality of the eye:
age-adjusted gradient index eye models for novel implant design

The crystalline lens plays a primary role in the optical performance of the eye. With age the lens progressively becomes less transparent because light is obstructed either by being scattered or absorbed. When this obstruction has advanced sufficiently to make vision difficult, the lens is said to have a cataract. In the majority of cases, this is treated surgically by removing the lens and replacing it with an intraocular implant lens. Although implant lenses make vision clearer, under some circumstances and conditions they can lead to visual problems, such as distorted images, glare, light flashes and haloes around bright light sources. To improve the design of implants a better understanding of the crystalline lens fine structure and its dynamic optical behaviour is required. The crystalline lens of the eye has a sophisticated gradient refractive index which is a result of its inhomogeneous protein distribution. In this research the refractive index profile will be measured using interferometry and ray-tracing. Attenuation factors and lens dynamic properties will also be measured and all the information collected will be employed in developing gradient refractive index lens models to determine what features are needed in more advanced future implant designs.

This research is directed by Prof. Barbara Pierscionek and supported by Fight for Sight.

Other Research Interests

  • Chromatic and monochromatic aberrations expansion
  • Dioptric, catoptric, and catadioptric zoom lenses
  • Catadioptric telescopes and their chromatic correction
  • Atmospheric dispersion correctors for extremely large telescopes




+44 (0)20 8417 4743

Roehampton Vale room 130