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Related Concept Videos

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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.
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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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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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The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
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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,...
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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...
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Author Spotlight: Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration
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Not just a red eye.

Valerie Juniat1, Nigel Andrew

  • 1Ophthalmology Department, Kent & Canterbury Hospital, Canterbury, UK.

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Summary
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A 70-year-old woman with metastatic breast cancer developed an iris mass causing eye pain and vision loss. Treatment with topical steroids, pressure-lowering agents, and radiotherapy successfully managed the ocular metastasis.

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Area of Science:

  • Ophthalmology
  • Oncology
  • Medical Imaging

Background:

  • Metastatic breast cancer can rarely present with ocular involvement.
  • Iris metastasis is an uncommon manifestation of advanced malignancy.

Observation:

  • A 70-year-old woman with a history of metastatic breast cancer presented with acute eye pain, redness, and decreased vision.
  • Ocular examination revealed a vascularized iris mass, pupillary distortion, intraocular inflammation, and elevated intraocular pressure.

Findings:

  • The patient was diagnosed with a right iris metastasis secondary to breast cancer.
  • Initial management with topical steroids and hypotensive agents improved ocular symptoms.

Implications:

  • This case highlights the importance of considering ocular metastasis in patients with a history of breast cancer presenting with eye symptoms.
  • Multimodal treatment including radiotherapy can be effective in managing iris metastasis, preserving vision and reducing tumor burden.