A mechanical three-step test.

Area of Science:

• Biomechanical engineering
• Ophthalmology
• Medical device development

Background:

• The Parks' three-step test is a standard clinical method for assessing ocular alignment and diagnosing strabismus.
• Accurate execution of the Parks' test is crucial for effective diagnosis and treatment planning.
• Existing methods may require specialized equipment or extensive training.

Purpose of the Study:

• To introduce a novel, simple mechanical device for performing the Parks' three-step test.
• To provide accessible instructions for constructing this device using readily available materials.
• To facilitate the accurate and efficient application of the Parks' test in clinical or research settings.

Main Methods:

• Design and construction of a mechanical binary search device using light cardboard.
• Detailed instructions for assembly and use of the device are provided.
• The device is engineered to simplify the steps involved in the Parks' test.

Main Results:

• A functional and easy-to-assemble mechanical device for the Parks' test has been developed.
• The device allows for straightforward execution of the three steps of the Parks' test.
• Construction requires minimal resources and technical expertise.

Conclusions:

• This simple mechanical device offers a practical and cost-effective solution for performing the Parks' three-step test.
• The accessibility of its construction promotes wider adoption and application in diagnosing ocular alignment.
• It serves as a valuable tool for clinicians and researchers involved in strabismus evaluation.