Open versus closed view autorefraction in young adults

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Objective autorefraction is crucial for determining refractive error.
• Existing research often compares autorefractors in children, with less focus on young adults.
• Modern autorefractors offer different viewing modalities (closed-view vs. open-view).

Purpose of the Study:

• To compare the concordance of non-cycloplegic refractive error measurements between a closed-view (Topcon TRK-2P) and an open-view (Grand Seiko WR-5500) autorefractor.
• To evaluate the agreement between two specific modern objective autorefractors in young adults.
• To assess refractive error using both isolated spherical components and vector notation (MSE, J0, J45).

Main Methods:

• Fifty young adults (aged 20-29 years) participated in the study.
• Non-cycloplegic autorefraction was performed on both eyes using the Topcon TRK-2P and Grand Seiko WR-5500.
• Refractive data were analyzed for the spherical component, Mean Spherical Error (MSE), J0, and J45.

Main Results:

• Mean Spherical Error (MSE) was -1.00 ± 2.40D for the Grand Seiko and -1.23 ± 2.29D for the Topcon.
• Seventy-six percent of measurements from the Topcon TRK-2P were within ±0.50D of the Grand Seiko WR-5500.
• Statistically significant mean differences were found for MSE and J0 (p < 0.01), but not for J45 (p > 0.05).

Conclusions:

• While differences in non-cycloplegic MSE between the two autorefractors are small, they are statistically significant.
• The Topcon TRK-2P may be clinically useful as an initial tool for subjective refraction.
• Further research is needed to minimize measurement discrepancies between different autorefractor models.