Design Process
Our team went through numerous iterations in the design of the lens for the iGlasses. Each was reviewed and discarded in favor of the technologies we use in the device today.
Lens made of flexible material
Before our group focused more on electronic refraction, we originally had come up with a pair of glasses whose lens were made of a flexible material that would stretch or contract using focus "knobs". The design was impractical and results were hard to measure. However, reviewing these requirements led to our selection of electronic refraction.
Kerr Effect for lens refraction
The Kerr effect seemed like an excellent opion. It changes
refraction at a much greater rate than the materials using the Pockels
effect. However, the chemicals used for this effect are toxic. 
Implanting iGlasses
We also considered implanting iGlasses in the eye, but found that to have potential complications such as those experienced by laser eye surgery patients -- halos around images, dry eyes, and potential permanent damage.
Section Summary
Team went through a rigorous process to come up with and filter ideas for the ideal design of the iGlasses
- Flexible material to adjust refraction
- Different chemical effects (Kerr effect) to alter the refraction
- Potential for implanting the device in the eye