Related Experiment Video
Updated: May 12, 2026
07:06
Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
Published on: March 29, 2022
Relationship between lenticular power and refractive error in children with hyperopia
Takeshi Tomomatsu1, Shinjiro Kono, Shogo Arimura
1Department of Ophthalmology, Faculty of Medical Sciences, University of Fukui, Fukuiken, Japan.
Clinical Ophthalmology (Auckland, N.Z.)
|April 12, 2013
Summary
In children aged 3-13 with hyperopia, lower lens power correlates with increased refractive error and age. This suggests lens power significantly impacts hyperopia development in pediatric populations.
Area of Science:
- Ophthalmology
- Pediatric Optometry
- Refractive Error Research
Background:
- Hyperopia is common in children and can impact visual development.
- Understanding the optical components contributing to refractive error is crucial for early intervention.
Purpose of the Study:
- To determine the contribution of axial length, lens power, and corneal power to spherical equivalent refractive error in hyperopic children.
- To investigate the relationship between these optical parameters and age in the pediatric population.
Main Methods:
- Noncontact optical biometry was used to measure axial length and corneal power in 62 hyperopic children (aged 3-13).
- Spherical equivalent refractive error was measured via automated refraction with cycloplegia.
- Lens power was calculated using the Sanders-Retzlaff-Kraff formula.
Main Results:
- A positive correlation was found between age and axial length (P=0.0014).
- A negative correlation was observed between age and lens power (P=0.0001).
- Lower lenticular power showed a significant negative correlation with the degree of hyperopia (P<0.0001).
Conclusions:
- Noncontact biometry revealed that reduced lens power is associated with increased hyperopia in children.
- This finding suggests that lenticular power plays a significant role in the development of hyperopia during childhood.
Related Concept Videos
01:16Focusing 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...
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
01:30Geometry of Hyperbolas
A hyperbola consists of all points where the absolute difference of distances to two fixed points, called foci, remains constant. The standard equation isEach branch extends infinitely and approaches two asymptotes, which guide the curve’s behavior. The parameters a and b define key features: a measures the distance from the center to each vertex along the transverse axis, while b influences the slopes of the asymptotes. The asymptotes have equationsA rectangle centered at the origin with...
01:22Photoreceptors and Visual Pathways
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...