Ocular Motility Test (Broad H Test)

The Ocular Motility Test, often called the Broad H Test, is a fundamental part of a comprehensive eye exam, especially for patients with suspected eye alignment issues. This simple, non-invasive evaluation allows our specialists at Pristine Eye Hospitals to assess how well your eyes move together and individually. It is a key diagnostic tool for conditions like strabismus (squint) and other neurological disorders affecting eye movement.

What is a Ocular Motility Test (Broad H Test)?

The Ocular Motility Test is a diagnostic procedure designed to evaluate the function of the six extraocular muscles that control the movement of each eye. During the test, your ophthalmologist observes your eyes as you follow a target moved in a specific pattern, resembling a large letter “H”. This pattern allows the doctor to isolate and assess each muscle’s strength, coordination, and range of motion, ensuring your eyes are working together as a team.

Why is this test performed?

This test is a critical component for diagnosing and managing various conditions. Your doctor may recommend it for several reasons, including:

To detect or monitor strabismus (squint), where the eyes are misaligned, or amblyopia (lazy eye).

To investigate symptoms such as double vision (diplopia), blurred vision, eye strain, or headaches that may be related to poor eye muscle control.

To assess the function of cranial nerves that control the eye muscles, which can be affected by neurological conditions, injury, or other systemic diseases.

As a routine part of a pediatric eye examination to ensure proper visual development and binocular vision.

How to Prepare for Your Ocular Motility Test (Broad H Test)

Excellent news—no special preparation is required for an Ocular Motility Test. It is a quick, straightforward, and painless part of your eye examination.

Please inform your ophthalmologist about any existing medical conditions or medications you are currently taking.

If you wear corrective lenses, be sure to bring your glasses or contact lenses to the appointment.

Simply relax. The test is non-invasive and only requires you to follow a target with your eyes.

The Procedure: What to Expect Step-by-Step

The Broad H Test is simple and efficient. Here’s what you can expect during your evaluation at Pristine Eye Hospitals:

1. You will be seated in a comfortable examination chair, directly facing the ophthalmologist. You will be asked to keep your head completely still during the short procedure.

2. The doctor will hold a small target, such as a penlight or their fingertip, approximately 16 inches away from your face.

3. You will be instructed to follow the target with your eyes only, without moving your head. The doctor will move the target in a large “H” pattern, and sometimes diagonally, to guide your eyes through all nine cardinal positions of gaze.

4. Throughout the movement, your doctor will carefully observe both of your eyes, looking for the smoothness of motion, full range, and perfect alignment.

Understanding Your Results

Immediately following the test, your ophthalmologist will be able to interpret the results. The goal is to see if both eyes move together smoothly, accurately, and symmetrically in all directions of gaze.

Normal results mean that your extraocular muscles and the nerves that control them are functioning correctly. If any abnormalities are detected, such as jerky movements (saccades or nystagmus), limited movement in a certain direction, or if one eye lags behind the other, it can indicate an underlying issue. These findings could point to strabismus, a nerve palsy, or a muscle restriction. Your specialist at Pristine Eye Hospitals will explain the findings in detail and discuss the next steps, which may include further testing or developing a personalized treatment plan.

Frequently Asked Questions