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Photoreceptors and Visual Pathways

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 Eyeball

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,...

Focusing of Light in the Eye

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...

Association Areas of the Cortex

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...

Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

The Retina

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.

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Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration

Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration

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Flashes, floaters and fuzz.

Sonali T Nagendran¹, Dhanes Thomas, Avinash Gurbaxani

¹Moorfields Eye Unit, St George's Hospital, London SW17 0QT. sonalinagendran@doctors.org.uk

British Journal of Hospital Medicine (London, England : 2005)

|February 16, 2013

Summary

This summary is machine-generated.

Patients often see flashing lights (photopsia) and floaters. This guide helps non-specialists understand the various causes of these common visual symptoms.

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Area of Science:

Ophthalmology
Optometry
Visual Science

Background:

Flashing lights (photopsia) and floaters are frequent reasons for hospital visits.
Understanding the underlying causes is crucial for appropriate patient management.

Purpose of the Study:

To provide a guide for non-specialists on pathologies causing photopsia and floaters.
To aid in the initial assessment and understanding of these visual symptoms.

Main Methods:

Review of common and critical causes of photopsia and floaters.
Categorization of pathologies based on visual presentation and potential severity.

Main Results:

Discussion of various conditions, including but not limited to retinal tears, vitreous detachment, and optic nerve issues.
Highlighting the importance of differentiating benign from sight-threatening causes.

Conclusions:

Accurate identification of the cause of flashing lights and floaters is essential for timely intervention.
This guide aims to improve non-specialist recognition and initial management of these visual disturbances.