Strabismus and Amblyopia

Specialized Care for Eye Alignment and Visual Development

Strabismus and amblyopia are closely related conditions, but they are not the same.

Strabismus affects the alignment of the eyes. Amblyopia affects how well the brain learns to use vision from one or both eyes. They may occur separately or together and can affect children as well as adults.


At Wyomissing Optometric Center, our doctors provide detailed evaluations, ongoing management, and individualized treatment recommendations to help patients achieve their best possible visual function.

What Is Strabismus?

Strabismus occurs when the eyes do not point in the same direction at the same time. One eye may look directly at a target while the other eye turns.



The eye turn may be constant or intermittent. It may affect the same eye each time or alternate between the two eyes.


Children with strabismus may suppress or ignore the image from one eye to avoid double vision. Adults who develop strabismus later in life are more likely to experience double vision because their brains are already accustomed to using both eyes together.

What Is Amblyopia?

Amblyopia is reduced vision caused by abnormal visual development during childhood. It is sometimes called “lazy eye,” although the eye itself is not lazy.


Amblyopia develops when the brain receives clearer or more reliable visual information from one eye and begins favoring that eye. Over time, the brain may reduce its use of information from the other eye.


Common causes include:

Strabismic Amblyopia

The brain may suppress the image from a consistently misaligned eye to prevent double vision.

Refractive Amblyopia

One eye may have significantly more farsightedness, nearsightedness, or astigmatism than the other. The brain favors the eye that provides the clearer image.


Bilateral Amblyopia

Both eyes may develop reduced vision when a significant prescription is present in both eyes and remains uncorrected during visual development.


Deprivation Amblyopia

A condition such as a congenital cataract, drooping eyelid, or another obstruction prevents a clear image from reaching the developing visual system.

Signs and Symptoms

Possible signs of strabismus or amblyopia include:

  • One eye turning inward, outward, upward, or downward
  • An eye turn that appears only when tired, ill, or visually stressed
  • Closing or covering one eye
  • Tilting or turning the head to see
  • Reduced vision in one eye
  • Poor depth perception
  • Reduced eye-hand coordination
  • Difficulty with certain sports or motor activities
  • Avoidance of visually demanding activities


Amblyopia may have no obvious symptoms. Because the stronger eye sees well, a child may not realize that vision is reduced in the other eye. This is one reason routine childhood eye examinations are important.

A Comprehensive Evaluation

Our evaluation examines both the health of the eyes and how the eyes work together.



Testing may include:

  • Visual acuity measured separately in each eye
  • Evaluation of the glasses prescription
  • Eye alignment at distance and near
  • Alignment in different positions of gaze
  • Eye movement and muscle function
  • Focusing ability
  • Depth perception and three-dimensional vision
  • Testing for suppression
  • Fixation preference and stability
  • Binocular coordination
  • Pupil and neurological screening
  • Complete ocular health examination


For children, we also consider birth history, developmental milestones, family history, school concerns, and previous treatment.

Treatment Options

Treatment depends on the patient’s age, diagnosis, severity, symptoms, visual potential, and previous care. More than one treatment may be recommended.


Prescription Glasses or Contact Lenses

Correcting nearsightedness, farsightedness, or astigmatism is often the first step. In some children, wearing the correct prescription improves vision and may also improve eye alignment.


Patching

A patch may be worn over the eye with stronger vision for a prescribed amount of time. This encourages the brain to use and develop vision from the amblyopic eye.


Patching schedules are individualized. Wearing a patch longer than prescribed is not necessarily better and may create additional problems.


Atropine Therapy

Prescription atropine drops may be placed in the eye with stronger vision to temporarily reduce its focusing ability. This encourages greater use of the amblyopic eye.


Atropine is prescribed and monitored by an eye doctor.


Prism Lenses

Prism may help selected patients manage double vision or reduce the effort required to align the eyes. Prism does not permanently strengthen or straighten the eyes and is not appropriate for every type of strabismus.


Occupational Vision Rehabilitation

Many patients benefit from structured activities designed to improve:

  • Awareness and use of the amblyopic eye
  • Eye teaming and binocular coordination
  • Depth perception
  • Suppression
  • Focusing and tracking
  • Visual-motor integration


Vision rehabilitation is used as part of a broader treatment plan. It does not replace glasses, patching, atropine, or surgery when those treatments are clinically indicated.


Strabismus Surgery

Surgery may be recommended when eye alignment cannot be adequately managed with lenses, prism, observation, or other treatment.


When surgery is appropriate, we coordinate care with a pediatric or strabismus ophthalmologist and continue to monitor visual acuity, alignment, and binocular function before and after the procedure. Often vision rehabilitation is appropriate to adapt to the new alignment after surgery.

Early Detection Matters

The visual system develops rapidly during childhood, so early diagnosis and treatment offer the best opportunity for improvement.



However, parents should not assume that treatment is no longer worthwhile simply because a child is older. Older children may still benefit from amblyopia treatment. The expected response depends on age, severity, cause, previous treatment, and consistency with the prescribed plan.

Goals of Treatment

Depending on the diagnosis, treatment goals may include:

  • Improving vision in the amblyopic eye
  • Encouraging more balanced use of the two eyes
  • Improving eye alignment
  • Reducing or eliminating double vision
  • Developing or improving depth perception
  • Supporting visual comfort and coordination
  • Preventing further loss of visual function
  • Improving confidence during school, work, sports, and daily activities


Not every patient will achieve perfect visual acuity, eye alignment, or depth perception. Our goal is to identify the most appropriate options and help each patient reach their best possible visual function.

Take the Next Step

Early identification of strabismus and amblyopia can protect visual development and expand treatment options. Adults experiencing a new eye turn or double vision should be evaluated promptly.


Important: New or suddenly worsening symptoms —including double vision, severe headache, repeated vomiting, weakness, slurred speech, increasing confusion, or unequal pupils —require immediate medical attention.