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Updated: Dec 20, 2025

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Folate-Modified Photoelectric Responsive Polymer Microarray as Bionic Artificial Retina to Restore Visual Function.

Zheng-Hang Yu1, Wei-Jian Chen1, Xi Liu2,3

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Researchers developed a novel bionic artificial retina using tiny phototransduction cells. This innovative device, implanted in rats, successfully restored photosensitive function, offering hope for vision restoration technologies.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Neuroscience

Background:

  • Restoring vision requires high-resolution artificial retinas that interface effectively with the optic nerve.
  • Current bionic eye technology faces challenges in achieving precise neural communication and high optical resolution.

Purpose of the Study:

  • To develop a bionic artificial retina with sub-neural cell-sized phototransduction units.
  • To enhance neural stimulation and integration through folic acid modification.
  • To evaluate the functional recovery of vision in a preclinical model.

Main Methods:

  • Fabrication of a pyramid-shaped periodic microarray of photoreceptor sensing cells using micrometer processing.
  • Utilizing polythiophene derivative/fullerene derivative (PCBM) as photoelectric converters.
  • Modification of polythiophene derivatives with folic acid tags to improve neural cell recognition and contact area.
  • Implantation of the artificial retina into blinded rats and subsequent electrophysiological analysis.

Main Results:

  • The developed artificial retina features phototransduction cells smaller than neural cells.
  • Folic acid modification enhanced the contact area and recognition of nerve cells.
  • Electrophysiological analysis confirmed the recovery of photosensitive function 3 months post-implantation in rats.
  • The system demonstrated successful communication with the optic nerve.

Conclusions:

  • This study presents an innovative approach to fabricating high-resolution bionic artificial retinas.
  • The folic acid-modified artificial retina shows significant potential for restoring vision by improving neural stimulation.
  • The technology holds promise for advancements in artificial intelligence and biomedicine, particularly in vision restoration.