[An alternative measuring procedure to the simultaneous prism cover test].

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• The simultaneous prism cover test is a common method for measuring manifest squint angles.
• Accurate measurement of squint angles is crucial for diagnosis and treatment planning in strabismus.

Purpose of the Study:

• To describe an alternative method for measuring manifest squint angles.
• To provide a new tool for ophthalmologists and optometrists in assessing eye alignment.

Main Methods:

• A collimated visible light beam illuminates one eye while the subject fixates on an object.
• The light source holder rotates until corneal and lens light reflexes align vertically within the pupil.
• The direction of the incident light beam then coincides with the optical axis of the eye.

Main Results:

• The described method allows for the determination of the optical axis direction of the eye.
• By measuring before and after covering, the difference in light directions quantifies the manifest squint angle.
• This provides an alternative measurement to the simultaneous prism cover test.

Conclusions:

• The described method offers a viable alternative for measuring manifest squint angles.
• This technique can aid in the clinical assessment of strabismus.
• Further studies may explore its clinical utility and comparison with existing methods.