[A Simplifed Model Eye for Testing Fundus Imaging Device].

Area of Science:

• Ophthalmic optics
• Biomedical engineering
• Medical device testing

Background:

• The Gullstrand I model eye is a standard for simulating ocular optics.
• Accurate model eyes are crucial for testing fundus imaging devices.
• Existing testing methods may require more efficient alternatives.

Purpose of the Study:

• To design and validate a simplified model eye for testing fundus imaging devices.
• To ensure the model eye replicates key refractive and optical characteristics of the human eye.
• To provide a potential replacement for the testing methods outlined in ISO 10940:2009.

Main Methods:

• Simulated ocular refractive tissue characteristics based on the Gullstrand I model.
• Ensured refractive index differences between adjacent materials are within 1%.
• Evaluated optical performance metrics including focal length, diffuse spot radii, chief ray angles, and Modulation Transfer Function (MTF) values.

Main Results:

• Achieved an equivalent focal length of 17 mm.
• Maintained relative refractive index differences below 1% for adjacent layers.
• Demonstrated acceptable differences in diffuse spot radii (≤15%), chief ray angles (≤1°), and MTF values (≤0.1) for a 3 mm incident aperture.

Conclusions:

• The developed simplified model eye meets key optical performance requirements.
• This model eye can serve as a reliable tool for testing fundus imaging devices.
• It offers a potential alternative to the current ISO 10940:2009 standard for ophthalmic instruments.