Novel switching mode in a vertically aligned liquid crystal contact lens

Area of Science:

• Ophthalmology
• Materials Science
• Optics

Background:

• Liquid crystal (LC) contact lenses represent an emerging technology for vision correction.
• Previous designs faced challenges with optical quality and construction complexity.

Purpose of the Study:

• To report on a homeotropically aligned LC contact lens with enhanced optical quality and simplified construction.
• To demonstrate a lens with no polarization dependence in the off state and continuous optical power adjustment.

Main Methods:

• Fabrication of a homeotropically aligned LC contact lens using a mixed polyimide alignment layer.
• Application of voltage to induce a change in the refractive index of the nematic LC layer.
• Rubbing the alignment layer to induce preferred director orientation, preventing switching defects.

Main Results:

• The developed LC contact lens exhibits no polarization dependence in the off state.
• A continuous optical power change of up to 2.00 ± 0.25 D was achieved with applied voltage.
• The refractive index of the nematic LC layer varied from 1.52 to a maximum of 1.72.
• Excellent optical quality was maintained due to the avoidance of switching defects.

Conclusions:

• The homeotropically aligned LC contact lens offers improved optical performance and simplified manufacturing.
• This design provides a continuous and adjustable optical power for vision correction.
• The alignment layer strategy effectively prevents defects, ensuring high-quality optics.