Numerical simulation has emerged as a widely used solution for understanding, studying, solving and improving industrial design since the democratization of the computational power at the end of the 20th century.


The most common method, known as the finite element method, uses the discretization of a problem in elements, whose behavior is described by partial differential equations, enabling to solve complex problems in a various array of fields (Fluidics, Heat Transfer, Structural Mechanics, Non-linear optics…).

Example of simulation in COMSOL Multiphysics © : simulation of the heating of hepatic tumor by an electric probe.



Numerical Multiphysics Simulation is a core competence at Kejako, we use it for modeling the biomechanics of the human accommodation, simulate the aging, a surgical procedure or an implant and evaluate its optical consequences. It is also a cornerstone of the development and optimization of our tools (optimization of laser impulsion, improvement of mechanical measurement device design…)

Full Parametric Eye Model

To solve presbyopia, Kejako developed an unique and advanced parametric model of the human eye, validated on real patient measurement and awarded.

This model integrates soft tissues biomechanics, advanced optics and fluidics. The geometry is parametric to adapt easily to any patient biometry from standard measurement devices like modern OCTs.


Initial purpose of the model was to understand the real mechanism of human accommodation and its aging, the presbyopia. We put and evaluated neutrally all information available in the literature through an extensive state of the art and put them against physics, to get rid of misconceptions, theories and beliefs.

“We can provide models that produce exactly what the patient sees, enabling us to better understand and treat presbyopia”

Aurélien Maurer

R&D, Kejako


Kejako’s actual understanding of accommodation and presbyopia is sustained by this work and allow us to identify today exactly the major cause of the loss of visual accommodation.

This physics based understanding allows us to evaluate our own solutions in-silico, but also existing solution of the market and understand why some may work and other don’t. Phakorestoration concept is born from this neutral perspective about accommodation.

You are interested about our eye model details or want to benefit from our expertise in the simulation in ophthalmology and biomechanics for a medical device ? Contact us.