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Questions and Answers
What is the primary purpose of using eyeglasses or contact lenses in the treatment of amblyopia?
What is the primary purpose of using eyeglasses or contact lenses in the treatment of amblyopia?
To improve the positioning of the eyes by modifying the patient's reaction to focus.
How do prisms help in the management of eye conditions like strabismus?
How do prisms help in the management of eye conditions like strabismus?
Prisms modify the way light and images hit the eye, providing comfort and preventing double vision.
What is the difference between resection and recession in eye muscle surgery?
What is the difference between resection and recession in eye muscle surgery?
Resection strengthens the muscle, while recession weakens it.
What role does Botox therapy play in treating eye muscle disorders?
What role does Botox therapy play in treating eye muscle disorders?
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After surgical treatment for strabismus, what are the subsequent treatments recommended?
After surgical treatment for strabismus, what are the subsequent treatments recommended?
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What is strabismus and how does it affect vision?
What is strabismus and how does it affect vision?
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Identify the types of strabismus based on the direction of eye movement.
Identify the types of strabismus based on the direction of eye movement.
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What are some risk factors associated with developing strabismus?
What are some risk factors associated with developing strabismus?
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What tests are commonly used to diagnose strabismus?
What tests are commonly used to diagnose strabismus?
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Describe the difference between constant and intermittent strabismus.
Describe the difference between constant and intermittent strabismus.
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What occurs during hypertropia, and how is it visually identified?
What occurs during hypertropia, and how is it visually identified?
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What is the significance of bilateral and unilateral classifications in strabismus?
What is the significance of bilateral and unilateral classifications in strabismus?
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How might extreme farsightedness lead to the development of strabismus?
How might extreme farsightedness lead to the development of strabismus?
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What is the primary difference between strabismus and amblyopia?
What is the primary difference between strabismus and amblyopia?
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At what age should infants be able to focus on objects and have straight eyes?
At what age should infants be able to focus on objects and have straight eyes?
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What percentage of children with strabismus are likely to develop amblyopia?
What percentage of children with strabismus are likely to develop amblyopia?
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What is a common cause of strabismus development in adults?
What is a common cause of strabismus development in adults?
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What diagnostic method is essential for assessing a patient with suspected strabismus?
What diagnostic method is essential for assessing a patient with suspected strabismus?
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What treatment method is used to encourage the use of a weak eye in patients with amblyopia?
What treatment method is used to encourage the use of a weak eye in patients with amblyopia?
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What types of amblyopia result from strabismus?
What types of amblyopia result from strabismus?
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What symptoms might an adult with strabismus experience?
What symptoms might an adult with strabismus experience?
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How do eyeglasses or contact lenses assist in treating eye alignment issues?
How do eyeglasses or contact lenses assist in treating eye alignment issues?
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Explain the purpose of using prisms in eye treatment.
Explain the purpose of using prisms in eye treatment.
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What are the main objectives of eye muscle surgery in strabismus treatment?
What are the main objectives of eye muscle surgery in strabismus treatment?
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How does Botox therapy function as a temporary treatment for eye muscle disorders?
How does Botox therapy function as a temporary treatment for eye muscle disorders?
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What is the goal of treatment after surgical intervention for strabismus?
What is the goal of treatment after surgical intervention for strabismus?
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What is strabismus and how does it manifest in the eyes?
What is strabismus and how does it manifest in the eyes?
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Name the two types of strabismus based on the direction of eye movement.
Name the two types of strabismus based on the direction of eye movement.
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What are some common risk factors for developing strabismus?
What are some common risk factors for developing strabismus?
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Describe the difference between constant and intermittent strabismus.
Describe the difference between constant and intermittent strabismus.
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What is hypertropia and how can it be visually identified?
What is hypertropia and how can it be visually identified?
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What does the cover test diagnose in strabismus?
What does the cover test diagnose in strabismus?
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What is the implication of having alternating strabismus?
What is the implication of having alternating strabismus?
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What can extreme farsightedness lead to in terms of eye alignment?
What can extreme farsightedness lead to in terms of eye alignment?
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What is the primary difference between congenital and acquired strabismus?
What is the primary difference between congenital and acquired strabismus?
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Explain what amblyopia is and how it differs from strabismus.
Explain what amblyopia is and how it differs from strabismus.
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What should parents do if they notice signs of strabismus in their child?
What should parents do if they notice signs of strabismus in their child?
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What is the approximate age range when strabismus commonly develops in children?
What is the approximate age range when strabismus commonly develops in children?
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What is a common symptom experienced by adults with acquired strabismus?
What is a common symptom experienced by adults with acquired strabismus?
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How can eye patching be used in the treatment of amblyopia?
How can eye patching be used in the treatment of amblyopia?
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What are some types of amblyopia mentioned in the content?
What are some types of amblyopia mentioned in the content?
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What role does a comprehensive ocular examination play in diagnosing strabismus?
What role does a comprehensive ocular examination play in diagnosing strabismus?
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Study Notes
Strabismus
- Misalignment of both eyes, the image of the object seen does not fall on the fovea of both eyes simultaneously.
- Affects 2-5% of the population, leading to visual impairment and cosmetic and social impacts.
- Can be tested using the corneal light reflection, cover test/alternating cover-uncover test.
Risk Factors
- Family history, if relatives have strabismus, a person is more likely to develop it.
- Refractive errors, extreme farsightedness (hyperopia) can develop strabismus because focusing necessary to keep vision clear.
- Medical conditions, people with Down syndrome or cerebral palsy, stroke or head injury are at higher risk for developing strabismus.
Types of Strabismus
- Esotropia (Endotropia) - inward turning of the eye.
- Exotropia - outward turning of the eye.
- Hypertropia - upward turning of the eye.
- Hypotropia - downward turning of the eye.
Additional Classifications
- Constant or Intermittent - how frequently does it occur
- Bilateral - both eyes converge or diverge at the same time.
- Unilateral - if it always involves the same eye.
- Alternating - when the turning is sometimes the right and other times the left eye.
When Does It Occur?
- Congenital - developing during infancy, children are born with squint.
- Acquired - developing in adulthood.
Strabismus vs Amblyopia
- Strabismus is NOT the same as Amblyopia.
- Amblyopia is "lazy eye", a condition where vision does not develop normally, usually during childhood.
- A child may have one weak eye with poor vision and the other totally normal.
- Amblyopia DOES commonly occur with Strabismus.
- Types of Amblyopia: Strabismic, Stimulus deprivation, Anisometropic, Bilateral ametropic, Meridional.
Development of Squint in Infants
- It is not normal for an infant's eyes to cross constantly.
- By the end of the fourth month of age the infant should be able to focus on objects and eyes should be straight, with no turning.
- 30-50% of children with strabismus develop secondary vision loss (amblyopia).
- The onset of strabismus is most common in children at 18 months to 6 years.
- If parents notice misalignment, they have to approach an eye specialist.
Development In Adults
- Most likely develops due to injury or disease.
- Adults will experience double vision, eye fatigue, blurred images, pulling sensation around the eyes, difficulty reading.
- If loss of vision occurs, it is typically due to exotropia rather than amblyopia.
Diagnosis
- Comprehensive ocular examination
- Patient History, detailed history is necessary to assess symptoms, health problems, and medications.
- Visual acuity, measurements are taken to assess the extent to which vision is affected.
- Refraction, conducted to determine the lens power necessary to compensate for any refractive error.
- Alignment and focussing, assessing how well both eyes focus, move, and work together.
- Eye health exam, assessing the structures of the eye to rule out any disease.
Treatment
- Eye Patch - the normal eye is patched to force the brain to interpret images from the strabismic eye. Eye patches will not change the angle of the strabismus. Typically, eye patching is used only if amblyopia is present. Duration depends on severity and age of the patient.
- Eyeglasses or Contact Lenses - used to improve positioning of the eye(s) by modifying the patient's reaction to focus. Eyeglasses and Contacts can also redirect the line of sight, which can help straighten the eye.
- Prisms - used to modify the way light and images hit the eye, the lenses provide comfort and can help prevent double vision from developing.
- Muscle Surgery - 2 types: Resection (strengthening the muscle) & Recession (weakening the muscle). Surgery may be necessary to align the eyes by modifying one or more muscles in the eye. The goal of treatment is to help the patient achieve binocular vision in all directions of gaze and at all distances.
- Botox Therapy - used as an alternative to eye muscle surgery. The idea is that the drug will temporarily relax the eye muscle, which will allow the opposite eye to tighten and straighten. The effects are short term (about 3 weeks). Eye muscle exercises and eyeglasses may also be used to help strengthen the eye.
Strabismus
- Strabismus refers to the misalignment of both eyes, where the image of an object doesn't fall simultaneously on the fovea of both eyes.
- Affecting 2-5% of the population, it leads to visual impairment, and has cosmetic and social impact.
- Strabismus is caused by the imbalance of 6 extraocular muscles that insert on the sclera of each eye, responsible for moving both eyes simultaneously and harmoniously.
Types of Strabismus
- Esotropia (Endotropia): Inward turning of the eye.
- Exotropia: Outward turning of the eye.
- Hypertropia: Upward turning of the eye.
- Hypotropia: Downward turning of the eye.
Risk Factors
- Family history: Increased likelihood of developing strabismus if relatives have it.
- Refractive errors: Extreme farsightedness (hyperopia) can lead to strabismus due to the extensive focusing effort required, leading to increased convergence.
- Medical conditions: Individuals with Down syndrome, cerebral palsy, stroke, or head injury are at a higher risk of developing strabismus.
Additional Classifications
- Constant or intermittent: Frequency of occurrence.
- Bilateral: Both eyes converge or diverge at the same time.
- Unilateral: Always involves the same eye.
- Alternating: Turning alternates between the right and left eye.
Development of Strabismus
- Congenital: Develops during infancy, children are born with the condition.
- Acquired: Develops in adulthood.
Strabismus vs. Amblyopia
- Strabismus is different from Amblyopia, also known as "lazy eye".
- Amblyopia is a condition where vision doesn't develop normally during childhood, usually affecting one eye.
- Amblyopia frequently occurs with strabismus.
Development in Infants
- It's not normal for an infant's eyes to cross constantly.
- By the age of four months, infants should focus on objects with straight eyes.
- 30-50% of children with strabismus develop secondary vision loss (amblyopia).
- Strabismus onset is most common between 18 months and 6 years.
- If parents notice any misalignment, they should consult an eye specialist.
Development in Adults
- Adults typically develop strabismus due to injury or disease.
- Symptoms include double vision, eye fatigue, blurred images, a pulling sensation around the eyes, and difficulty reading.
- Vision loss in adults is mainly caused by exotropia, not amblyopia.
Diagnosis
- Comprehensive ocular examination.
- Patient history: Detailed assessment of symptoms, health problems, and medications.
- Visual acuity: Measures the extent of vision impairment.
- Refraction: Determines the lens power needed to compensate for refractive errors.
- Alignment and focusing: Evaluates how both eyes focus, move, and work together.
- Eye health exam: Assesses eye structures to rule out any disease.
Treatments
- Eye Patch: Used to force the brain to interpret images from the strabismic eye by obstructing vision in the normal eye.
- Eyeglasses or Contact Lenses: Used to improve eye positioning by modifying focusing effort.
- Prisms: Modify the way light and images hit the eye, providing comfort and preventing double vision development.
-
Muscle Surgery: Two types:
- Resection (strengthening the muscle)
- Recession (weakening the muscle)
- Aims to align the eyes by modifying the position or length of eye muscles.
- Botox Therapy: Temporarily relaxes the eye muscle, allowing the opposite eye to tighten and straighten, offering short-term effects.
Goals of Strabismus Treatment
- Achieving binocular vision in all directions of gaze and at all distances.
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Description
This quiz explores strabismus, a condition characterized by misalignment of the eyes that can lead to various visual impairments. It covers risk factors, types of strabismus, and diagnostic tests. Gain insights into this condition and its impact on individuals.