Dominic Stone
Muscle balance phoria, also known as eye muscle balance, is a term used to describe the alignment of the eyes. Phoria is a common condition where the eyes are misaligned, causing them to have a resting point that is not perfectly aligned. While phoria is normal and does not disrupt everyday life, it can lead to eye strain and fatigue, especially in individuals with large heterophoria. In some cases, a pre-existing phoria can progress to a tropia, a more severe form of eye misalignment that can lead to double vision and impaired depth perception. To test for phoria, eye doctors perform the cross-over test, which involves covering one eye and then quickly covering the other, breaking the synchronization of binocular vision. Treatment options for phoria include optical correction through glasses, prism glasses, and in severe cases, extraocular muscle surgery.
| Characteristics | Values |
|---|---|
| Definition | Phoria is a misalignment of the eyes so that their natural resting point is not perfectly aligned. |
| Detection | To test for phoria, eye doctors will do the cross-over test, which is when one eye is covered and then the other eye is quickly covered after. |
| Treatment | The best way to treat phoria is optical correction via glasses. Prism glasses can also be used, but they are only a temporary fix. Extraocular muscle surgery is another option but should only be considered for patients whose best-corrected strabismic angle is still too large. |
| Relation to Strabismus | Strabismus is the term to describe when one’s eyes are misaligned. Phoria is a type of strabismus. |
| Relation to Tropia | Phorias and tropias are terms used by eye doctors to describe eye muscle deviations. A phoria is when the eyes are misaligned only when fusion is broken, i.e., one eye is covered or when the two eyes are looking at different targets. A tropia is a misalignment of the eyes that is always present. |
| Relation to Fusional Vergence Dysfunction | Phorias are often overcome through the fusional vergence system and thus may go unnoticed. These situations are considered to be a “compensated phoria”. When the fusional vergence system is not strong enough to overcome a phoria, it is called a “decompensated phoria”. |
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What You'll Learn
Phoria is a misalignment of the eyes
Phoria is a type of eye condition that causes a misalignment of the eyes. It is characterised by a deviation from the normal alignment of the eyes, which can lead to eye strain and even double vision. This condition typically presents itself when an individual is fatigued and their ability to compensate for the deviation is impaired.
Phoria is often detected during eye examinations, specifically during the cover test. During this test, the eye doctor alternates between covering and uncovering the patient's eyes while they focus on a target. If the patient's eye moves upon uncovering, it indicates a phoria. While everyone has a normal phoric resting position, some individuals have a larger than normal phoria that can be challenging to manage consistently.
The impact of phoria can vary depending on its severity. In some cases, individuals with larger phorias may experience difficulty keeping their eyes aligned, particularly after a long day or during stressful periods. This condition can also lead to eyestrain and headaches as the individual exerts effort to maintain fixation on a target.
Phoria is distinct from tropia, another type of eye muscle deviation. While phoria is a latent or hidden deviation that becomes apparent when binocular viewing is disrupted, tropia is a constant misalignment of the eyes that is always present, even when the eyes are open and attempting to work together. This distinction is important in understanding the nature and impact of these eye conditions.
The terms phoria and tropia are used by eye doctors to describe eye muscle deviations and the associated eye alignment problems. These conditions can lead to diplopia, or double vision, and impact an individual's ability to fuse images effectively. In some cases, phoria can progress to tropia if the deviation becomes more pronounced and challenging to manage.
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Phoria is normal and won't disrupt everyday life
Phoria is a common eye condition that affects many people. It is a type of eye muscle imbalance, also known as heterophoria, where the eyes are misaligned and do not have a perfectly aligned natural resting point. While this condition can cause eye strain and fatigue, it is important to understand that phoria is typically a mild issue that will not disrupt everyday life.
Phoria is often undetected and can go unnoticed for long periods. This is because the brain is usually able to compensate for the misalignment, allowing individuals to see a clear and single image. This is known as a "compensated phoria". The brain can effectively overcome the misalignment, and the individual may not even be aware of their condition.
In some cases, however, the brain may not be able to compensate adequately, leading to a "decompensated phoria". This typically occurs when an individual is tired or has spent a significant amount of time doing near work, such as reading or using a computer. As a result, they may experience double vision, eye strain, and fatigue. Even in these cases, phoria is still manageable and can often be addressed through vision therapy or optical correction.
While phoria can cause some discomfort and inconvenience, it is important to note that it is a normal condition that the brain can usually adapt to. It does not indicate any serious underlying issues and can be effectively managed through various treatments. Individuals with phoria can still lead normal lives and perform their daily activities without significant disruption.
In summary, phoria is a common eye condition that can cause minor disruptions, but it is typically well-managed by the brain and does not interfere with everyday life. While treatment options are available, they are often not necessary, as the condition is mild and the brain can adapt to maintain clear vision.
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Decompensated phorias occur when the phoria is abnormally high
Muscle balance phoria, or simply phoria, refers to the muscular balance of the eyes. Phoria is a measure of the eye muscle deviations that cause eye alignment problems. During an eye examination, a patient's phoria can be determined by alternately covering and uncovering their eyes while they fixate on a target. If the eye moves upon being uncovered, the patient has a phoria.
Some people have a larger than normal phoria that they can compensate for most of the time. However, because their phoria is abnormally high, they cannot always compensate for it when they are fatigued. As a result, their phoria may manifest as a tropia, or a misalignment of the eyes that is always present. This can lead to eye strain, headaches, and double vision.
The treatment for decompensated phorias depends on the underlying cause. In some cases, strabismus surgery may be performed to restore binocularity. In other cases, a patient may be advised to reduce screen time or visit a vision specialist to find a suitable treatment.
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Phoria can be caused by a large amount of hyperopia or farsightedness
Phoria is a misalignment of the eyes that only appears when a person is tired, and therefore it is not present all the time. It is a common eye condition that can cause eye strain and headaches. During an eye examination, an eye doctor will perform a cover test to determine whether a patient has phoria. If the uncovered eye moves, the patient has phoria.
Phorias can be caused by a variety of factors, one of the most common being a large amount of hyperopia or farsightedness. Globally, hyperopia affects about 4.6% of children and 30.9% of adults. When young children have significant undiagnosed farsightedness, they struggle to see clearly. To compensate, a child will attempt to focus their eyes intently, which induces an accommodation reflex. With this reflex, the eyes will increase the refractive power of the human lens and decrease the pupil size. Depending on the size of the object and the amount of blur, the eyes turn inwards—a process known as convergence. When a child's eyesight is extremely farsighted, the process that is originally designed to bring clearer near vision occurs in the distance. This causes the eye that has the farsighted refractive error to turn inward, even when looking at distant objects. This is called esotropia, specifically, accommodative esotropia.
Hyperopia or farsightedness is an eye condition that causes blurry vision when looking at things up close, such as words in a book. It is a refractive error, meaning that it is caused by problems with how the eye bends light. In a person with hyperopia, light enters the eye but doesn't hit the retina. Instead, light rays are under-focused, landing behind the retina. While some people may not notice any problems with their vision, others may experience symptoms such as blurry vision, especially when looking at objects close to the face. In addition to glasses, contact lenses, and surgery, eye exercises have also been shown to be effective in treating hyperopia.
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Phoria can be treated with vision therapy
Phoria is a latent form of eye misalignment. It is typically unnoticed because the brain and eye muscles work together to keep the eyes aligned. However, phoria can cause eye strain, headaches, blurred or double vision, and carsickness. It is important to consult with eye care professionals to find the best treatment plan for each individual.
NeuroVisual Medicine is a clinical approach to treating phorias and binocular vision dysfunction (BVD) that enables optometrists to identify and treat patients with custom-fit microprism lenses. This approach can provide significant symptom relief, even during the first exam.
While phoria can be effectively managed, there is no one-size-fits-all cure. Traditional comprehensive exams often fail to detect subtle phorias, and optometrists may miss opportunities to treat patients with common symptoms of BVD, such as headaches, nausea, and carsickness. Therefore, it is important for optometrists to incorporate binocular vision into their practices and stay up-to-date with the latest approaches to finding and treating vision misalignment.
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