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Questions and Answers
What is the purpose of performing a cycloplegic refraction?
In uncorrected hyperopia, what can excessive amounts of accommodation lead to?
When one eye turns inward due to uncorrected hyperopia, what visual symptom may occur?
What is a possible consequence of prolonged near work in children with uncorrected hyperopia?
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What happens when the visual system experiences overconvergence in uncorrected hyperopia?
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What is a potential consequence of asymmetrical high myopia in children?
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According to Donders (1864), what is a potential cause of myopia?
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What factor did Strenstroms and Sorsby determine to be associated with an increase in axial length?
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How does accommodation contribute to myopia according to the provided text?
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What effect can high body temperature have on myopia according to animal studies?
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Based on Von Alphen's theory, how does the ciliary body and choroid contribute to limiting scleral stretch?
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What is the purpose of placing a lens ≥+1.50D during a refraction procedure?
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What is the working distance for the retinoscope when performing retinoscopy on a patient's eye?
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In retinoscopy, which eye of the patient is scoped with the examiner's OD?
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What is the purpose of setting up the phoropter with a target of 20/200 or larger with R/G filter at a distance?
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What is the IPD (Interpupillary Distance) typically measured for during a refraction procedure?
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Why should both the examiner's eyes and the patient's eyes be at the same level during a refraction procedure?
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Study Notes
Cycloplegic Refraction
- Purpose: to relax accommodation and obtain accurate refraction in patients, especially children
Uncorrected Hyperopia
- Excessive accommodation can lead to eye strain, headaches, and blurred vision
- One eye turning inward can cause esotropia and diplopia
- Prolonged near work can lead to increased myopia in children
- Overconvergence can cause visual fatigue and eye strain
Myopia
- Asymmetrical high myopia in children can lead to amblyopia and strabismus
- Donders (1864) suggested that near work and accommodation can cause myopia
- Strenstroms and Sorsby found that near work increases axial length, contributing to myopia
- Accommodation can contribute to myopia by increasing axial length and scleral stretch
- High body temperature in animal studies has been shown to increase myopia
Retinoscopy and Refraction
- Lens ≥+1.50D is used to relax accommodation during refraction
- Working distance for retinoscope is 1-2 feet from the patient's eye
- Examiner's OD (right eye) is used to scope the patient's right eye
- Phoropter is set up with a target of 20/200 or larger with R/G filter at a distance to simulate real-life vision
- IPD (Interpupillary Distance) is typically measured during refraction
- Examiner's and patient's eyes should be at the same level to ensure accurate measurements
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Description
Test your knowledge on latent hyperopia and cycloplegic refraction. Learn about hypermetropia that is revealed only under cycloplegia, the importance of cycloplegic refraction, and the implications of excessive accommodation in hyperopia.
