What is the primary purpose of the corneal reflex pupillometer?

The primary purpose of the corneal reflex pupillometer is to accurately determine the pupillary distance, which is a critical measurement in vision care. This tool uses infrared technology to measure the distance between the centers of the pupils. This measurement is vital for proper lens fitting, as it ensures that optical centers of the lenses are aligned with the wearer's pupils, allowing for optimal vision correction.

Accurate pupillary distance is essential for ensuring that those who wear glasses experience the best possible visual outcomes, reducing the risk of optical distortions and enhancing comfort during wear. Given that the other choices pertain to unrelated measurements or assessments, they do not serve the same focus and purpose that the pupillometer is specifically designed for.