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Maintaining ocular safety with light exposure, focusing on devices for optogenetic stimulation
Boyuan Yan1, Maksim Vakulenko1, Seok-Hong Min2
1Weill Cornell Medical College, Department of Physiology and Biophysics, New York, NY 10065, USA.
Abstract:
Optogenetics methods are rapidly being developed as therapeutic tools for treating neurological diseases, in particular, retinal degenerative diseases. A critical component of the development is testing the safety of the light stimulation used to activate the optogenetic proteins. While the stimulation needs to be sufficient to produce neural responses in the targeted retinal cell class, it also needs to be below photochemical and photothermal limits known to cause ocular damage. The maximal permissible exposure is determined by a variety of factors, including wavelength, exposure duration, visual angle, pupil size, pulse width, pulse pattern, and repetition frequency. In this paper, we develop utilities to systematically and efficiently assess the contributions of these parameters in relation to the limits, following directly from the 2014 American National Standards Institute (ANSI). We also provide an array of stimulus protocols that fall within the bounds of both safety and effectiveness. Additional verification of safety is provided with a case study in rats using one of these protocols.
Insights
This study provides tools to assess optogenetic light stimulation safety for neurological disease therapies, ensuring effective neural responses without causing eye damage. Protocols are validated in rats.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Ophthalmology
Background:
- Optogenetics shows promise for treating neurological disorders, especially retinal degenerative diseases.
- Ensuring the safety of light stimulation is crucial for therapeutic optogenetics.
- Light stimulation must be effective for neural response but below ocular damage thresholds.
Purpose of the Study:
- To develop systematic utilities for assessing optogenetic light stimulation safety parameters.
- To ensure light stimulation is within photochemical and photothermal safety limits.
- To align safety assessments with the 2014 American National Standards Institute (ANSI) guidelines.
Main Methods:
- Developing computational tools to analyze safety parameters (wavelength, duration, visual angle, etc.).
- Establishing stimulus protocols balancing safety and therapeutic effectiveness.
- Conducting a case study in rats to verify safety protocols.
Main Results:
- Utilities were created to efficiently assess contributions of various light stimulation parameters to safety limits.
- A range of safe and effective optogenetic stimulus protocols were identified.
- A rat model confirmed the safety of a developed protocol.
Conclusions:
- Systematic assessment of light stimulation parameters is essential for safe optogenetic therapies.
- The developed utilities and protocols support the advancement of optogenetics in treating retinal diseases.
- This work provides a framework for ensuring the safety of light-based neurological therapies.
