Latent Hyperopia and Cycloplegic Refraction Quiz
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Questions and Answers

What is the purpose of performing a cycloplegic refraction?

  • To correct astigmatism
  • To strengthen the eye muscles
  • To measure the patient's current refractive error without any influence from accommodation (correct)
  • To investigate retinal health

In uncorrected hyperopia, what can excessive amounts of accommodation lead to?

  • Retinal detachment
  • Astigmatism
  • Myopia
  • Crossed eyes (esotropia) (correct)

When one eye turns inward due to uncorrected hyperopia, what visual symptom may occur?

  • Peripheral vision loss
  • Sensitivity to light
  • Blurry vision
  • Monocular diplopia (double vision with one eye) (correct)

What is a possible consequence of prolonged near work in children with uncorrected hyperopia?

<p>Difficulty reading and serious eyestrain (B)</p> Signup and view all the answers

What happens when the visual system experiences overconvergence in uncorrected hyperopia?

<p>Double vision (diplopia) (C)</p> Signup and view all the answers

What is a potential consequence of asymmetrical high myopia in children?

<p>Development of amblyopia in the eye with higher myopia (D)</p> Signup and view all the answers

According to Donders (1864), what is a potential cause of myopia?

<p>Prolonged tension on the eyes during close work (A)</p> Signup and view all the answers

What factor did Strenstroms and Sorsby determine to be associated with an increase in axial length?

<p>Prolonged near work (D)</p> Signup and view all the answers

How does accommodation contribute to myopia according to the provided text?

<p>Blockage of aqueous humor flow due to sphincter muscle action (B)</p> Signup and view all the answers

What effect can high body temperature have on myopia according to animal studies?

<p>Scleral stretch (D)</p> Signup and view all the answers

Based on Von Alphen's theory, how does the ciliary body and choroid contribute to limiting scleral stretch?

<p>&quot;Form an elastic envelope&quot; (B)</p> Signup and view all the answers

What is the purpose of placing a lens ≥+1.50D during a refraction procedure?

<p>To relax the patient's accommodation (B)</p> Signup and view all the answers

What is the working distance for the retinoscope when performing retinoscopy on a patient's eye?

<p>50 cm (A)</p> Signup and view all the answers

In retinoscopy, which eye of the patient is scoped with the examiner's OD?

<p>Right eye (OD) (D)</p> Signup and view all the answers

What is the purpose of setting up the phoropter with a target of 20/200 or larger with R/G filter at a distance?

<p>To test visual acuity of the patient (C)</p> Signup and view all the answers

What is the IPD (Interpupillary Distance) typically measured for during a refraction procedure?

<p>All vision types (C)</p> Signup and view all the answers

Why should both the examiner's eyes and the patient's eyes be at the same level during a refraction procedure?

<p>To maintain proper alignment for assessing convergence (C)</p> Signup and view all the answers

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.

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