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Related Concept Videos

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

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Updated: Jun 6, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
05:36

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Published on: October 18, 2024

Child development and refractive errors in preschool children.

Josephine O Ibironke1, David S Friedman, Michael X Repka

  • 1Dana Center for Prevention Ophthalmology, Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, Maryland, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|December 15, 2010
PubMed
Summary
This summary is machine-generated.

Parental concerns about child development may indicate significant refractive errors like astigmatism and anisometropia in young children. Early eye exams are recommended for children with developmental concerns to rule out vision problems.

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Area of Science:

  • Pediatric Ophthalmology
  • Developmental Pediatrics

Background:

  • Parental concerns about child development are common.
  • Early identification of developmental issues is crucial for intervention.

Purpose of the Study:

  • To investigate the association between parental concerns regarding overall development and significant refractive errors in preschool children.
  • To determine if developmental concerns predict specific types of vision impairments.

Main Methods:

  • A population-based, cross-sectional study involving 2381 children aged 6-71 months.
  • Comprehensive eye examinations with cycloplegic refraction were performed.
  • Parental concerns were assessed using the Parents' Evaluation of Developmental Status screening tool.

Main Results:

  • Parental concerns were reported in 21.4% of children.
  • Concerns were associated with astigmatism (OR=1.44) and anisometropia (OR=2.61).
  • The association was stronger in children over 36 months with hyperopia, astigmatism, or anisometropia; no association with myopia was found.

Conclusions:

  • Parental concerns about development are linked to specific refractive errors, particularly astigmatism and anisometropia, in young children.
  • Referral for comprehensive eye examinations is warranted for children with parental developmental concerns.
  • Early detection and management of refractive errors can prevent long-term vision consequences.