Development and applicability of a smartphone torch based emergency light source for microscopy.

Area of Science:

• Microscopy and optical instrumentation
• Biomedical engineering
• Emergency preparedness in scientific settings

Background:

• Microscopes typically have built-in illuminators, rendering them unusable during power outages without an alternative light source.
• Smartphone torches offer a readily available alternative light source, but manual holding is impractical during microscopy.
• A stable, hands-free solution is needed to integrate smartphone illumination into microscopy workflows.

Purpose of the Study:

• To develop a simple stand for a smartphone torch to be used as a microscopy light source.
• To evaluate the practical applicability and reliability of a smartphone torch-based illumination system for microscopy.

Main Methods:

• A cardboard stand was constructed to position a smartphone torch.
• An optical diffuser was created using white polyethylene plastic to soften the light.
• Faculty members rated slide image quality under both built-in microscope illumination and the smartphone torch system using a 10-point Likert scale.
• Reliability was assessed using Intraclass Correlation Coefficients (ICC).

Main Results:

• The developed smartphone torch system enabled effective slide examination.
• Image quality received a high overall score of 9.36 ± 0.86 (range 6-10) from 16 observers across 11 slides.
• High reliability was demonstrated with interrater ICC of 0.939, intrarater ICC of 0.853, and test-retest ICC of 0.889 (all P < 0.001).

Conclusions:

• A smartphone torch stand with an optical diffuser is a viable emergency illumination solution for microscopy.
• This low-cost, adaptable device can significantly aid scientific work in areas with frequent power interruptions.
• The system offers good to excellent reliability, making it a practical tool for maintaining microscopy capabilities.