Motorized semi-automated prism bar technique for enhanced prismatic evaluation.

Area of Science:

• Ophthalmology
• Optometry
• Biomedical Engineering

Background:

• Conventional prism bar testing for horizontal fusional vergence is susceptible to significant measurement errors.
• Limitations include examiner variability, improper prism positioning, and inconsistent patient-eye distance, impacting diagnostic accuracy.

Purpose of the Study:

• To develop and functionally design a motorized semi-automated prism bar system.
• To enhance the accuracy, reliability, and repeatability of horizontal fusional vergence testing.

Main Methods:

• A cost-effective semi-automated prism bar system was engineered using a 24-V DC motor, lead screw, gear set, stroke rod, and limit switches.
• A chin-and-headrest mechanism ensures a constant prism-to-eye distance, while motorized linear movement provides precise prism positioning.
• Limit switches and a control unit manage the system's operation and power supply.

Main Results:

• The motorized prism bar enables precise, button-activated linear movement in 1.5-cm increments.
• The system minimizes human error associated with manual prism bar handling and positioning.
• Improved accuracy and repeatability in horizontal fusional vergence measurements were achieved.

Conclusions:

• The developed motorized semi-automated prism bar addresses critical limitations in conventional testing methods.
• This innovation offers a reliable and accurate solution for clinical horizontal fusional vergence assessment.
• Enhanced patient comfort and diagnostic precision are key benefits of this new system.