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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors 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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Prosopagnosia01:24

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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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Related Experiment Video

Updated: Jun 12, 2026

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes
06:25

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

[Achromatopsia].

C M Poloschek1, S Kohl

  • 1Universitäts-Augenklinik, Freiburg, Deutschland. charlotte.poloschek@uniklinik-freiburg.de

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|June 10, 2010
PubMed
Summary
This summary is machine-generated.

Autosomal recessive achromatopsia is a frequent stationary cone disorder causing severe vision loss and color blindness from infancy. Genetic testing is crucial for diagnosis, prognosis, and genetic counseling.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Medical Science

Context:

  • Hereditary cone diseases encompass both progressive and stationary vision disorders.
  • Autosomal recessive achromatopsia is the most common stationary cone disorder, presenting in early infancy.
  • Key symptoms include nystagmus, photophobia, inability to discriminate colors, and significantly reduced visual acuity.

Purpose:

  • To outline the diagnostic criteria for autosomal recessive achromatopsia.
  • To differentiate achromatopsia from other stationary cone disorders and progressive dystrophies.
  • To emphasize the importance of clinical and genetic diagnosis for patient management.

Summary:

  • Autosomal recessive achromatopsia, a stationary cone disorder, is characterized by early-onset nystagmus, photophobia, and severe visual impairment.
  • Diagnosis requires ophthalmic examination, color vision testing, and electrophysiology.
  • Genetic examination is vital for distinguishing it from other cone disorders and guiding prognosis and genetic counseling.

Impact:

  • Accurate diagnosis facilitates individualized prognoses for patients with hereditary cone diseases.
  • Genetic counseling and appropriate low vision aid selection are enabled by precise clinical and genetic identification.
  • Distinguishing achromatopsia from other conditions ensures targeted management strategies.