Visual acuities as measured with an automatic intelligent visual acuity chart projector and standard logarithmic...

Area of Science:

• Ophthalmology and Vision Science
• Medical Devices and Technology

Background:

• Accurate visual acuity (VA) measurement is crucial for diagnosing and monitoring eye conditions.
• Traditional visual acuity charts may have limitations in modern clinical settings.
• Novel technologies like intelligent projector (IP) charts aim to improve VA testing efficiency and accuracy.

Purpose of the Study:

• To evaluate the repeatability of VA measurements using a new intelligent projector (IP) chart (LSJ-IVAC-6000A).
• To assess the consistency of VA measurements between the IP chart and the standard logarithmic visual acuity (SL) chart (GB11533-2011).

Main Methods:

• Prospective comparative study involving 53 subjects for repeatability and 100 subjects for consistency analysis.
• Intraclass correlation coefficient (ICC) and Bland-Altman analyses were used to assess repeatability and consistency.
• Visual acuity was recorded using the logMAR method, and test duration was timed.

Main Results:

• The IP chart demonstrated high repeatability with ICC values of 0.968 (right eye) and 0.964 (left eye).
• Good consistency was observed between the IP and SL charts, with ICC values of 0.946 (right eye) and 0.817 (left eye).
• The IP chart showed comparable test times to the SL chart, with no significant difference (p=0.668).

Conclusions:

• The novel intelligent projector visual acuity chart exhibits excellent repeatability.
• The IP chart demonstrates overall good consistency with the standard logarithmic visual acuity chart.
• The IP chart is a reliable tool for visual acuity measurement in clinical practice.