Eye Movement

Cartoon image of an eyeball connected to a brain.

Eye movement refers to the voluntary and involuntary movements of the eyes that assist with obtaining, fixating and following visual stimuli. The eyes are each connected to a system of six muscles. Light is sensed by the retina, which is a type of tissue that contains cells known as photoreceptors. These cells translate light into electrochemical signals that move along the optic nerve fibers to the brain. Once they reach the brain, the signals are interpreted as vision in the visual cortex and the brain applies meaning to what is being seen.

How Your Eyes Interpret Movement

And just as the eyes send signals to the brain, the brain sends signals to the eyes. Three cranial nerves transport signals from the brain to the muscles attached to each eye. This ultimately controls both voluntary and involuntary eye movements.

There are four types of eye movement:

  • Saccades – rapid, flying movements of the eyes that suddenly change the point of fixation. These movements range in scale from the tiny movements made while reading to greater movements made while scanning a room
  • Vergence movements – these movements bring into the line the area of the retina (fovea) designed for high perception
  • Smooth pursuit movements – steady tracking movements that are meant to keep moving stimulus in focus
  • Vestibulo-ocular movements – helps stabilize the eyes when the head’s position moves

Poor eye muscle control or injury/trauma can affect the eyes’ ability to move in harmony, leading to eye movement disorders like:

  • Nystagmus – fast, uncontrollable movements of the eyes. This can sometimes be referred to as dancing eyes
  • Strabismus – the eyes are misaligned and not aimed in the same direction. This may cause crossed eyes or other vision problems like lazy eye

Correcting Eye Movement Problems

If an individual has problems with eye movement, vision therapy is one treatment that can help by using vision exercises and specialized equipment to strengthen the eye muscles, leading to more fluid, cooperated eye movement.

Performed under the guidance of an optometrist, vision therapy is conducted in an office setting up to twice a week for an hour. The types of exercises and equipment will be tailored to meet the individual needs of the patient and are based on the severity of the eye movement problem, as well as any associated symptoms. These influences will also establish the number of sessions the patient requires. To accompany in-house visits, the optometrist may also instruct the patient on how to perform certain vision exercises at home.

Equipment that may be used during a vision therapy session includes:

  • Therapeutic or corrective lenses
  • Optical filters
  • Prisms
  • Occluders or eye patches
  • Balance boards
  • Computer software
  • Vision-motor-sensory training equipment
  • Electronic target with programmed apparatuses

When vision therapy is over, and all necessary sessions have concluded, the patient should be able to perform the four types of eye movement with greater ease and should be more efficient when it comes to processing and interpreting visual information.

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