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Repeatability and Validity of Peripheral Refraction with Two Different Autorefractors
Ann M Morrison, Donald O Mutti1
1The Ohio State University College of Optometry, Columbus, Ohio.
Summary
The Welch Allyn SureSight demonstrates superior repeatability and validity for peripheral refractive error measurements compared to the Plusoptix PowerRefractor, making it ideal for infant studies.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Peripheral refractive error assessment is crucial for understanding emmetropization in infants.
- Limited data exists on the repeatability and validity of portable autorefractors for infant peripheral refraction.
Purpose of the Study:
- To evaluate the validity and repeatability of peripheral refractive error measurements using Welch Allyn SureSight and Plusoptix PowerRefractor.
- To compare these instruments against the Grand Seiko WR-5100K criterion standard.
Main Methods:
- Cycloplegic autorefraction was performed on 21 adults using three instruments (SureSight, PowerRefractor, WR-5100K).
- Measurements were taken centrally and at 20°/30° temporal and nasal gaze on two separate occasions.
- Data was analyzed for validity and repeatability across different gaze directions.
Main Results:
- SureSight measurements showed good agreement with the Grand Seiko WR-5100K across all gazes.
- PowerRefractor measurements were significantly more myopic and differed in multiple gaze directions.
- SureSight exhibited better or comparable repeatability to the WR-5100K and superior repeatability to the PowerRefractor.
Conclusions:
- The Welch Allyn SureSight is the preferred portable autorefractor for monitoring peripheral autorefraction in infants.
- Its superior validity and repeatability support its use in future refractive error and emmetropization research.
