Sight

Sight or vision is a sense that allows organisms to perceive and interpret the visual details of the environment. It is primarily facilitated by the eye, which captures light and processes it into images. The process of sight involves several complex steps, including the capture of light by the cornea, the focusing of light by the lens, and the conversion of light into electrical signals by the retina. These signals are then transmitted to the brain via the optic nerve, where they are interpreted as visual images.

Anatomy of the Eye

The eye is the primary organ of sight. It is a complex structure that includes several key components, each of which plays a crucial role in the process of vision.

Cornea

The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. It is responsible for refracting, or bending, light as it enters the eye.

Lens

The lens is a transparent, biconvex structure located behind the iris. It further refracts light and focuses it onto the retina.

Retina

The retina is a thin layer of tissue located at the back of the eye. It contains millions of photoreceptor cells that convert light into electrical signals.

Process of Vision

The process of vision begins when light enters the eye through the cornea. The cornea and lens work together to focus this light onto the retina. The photoreceptor cells in the retina then convert the light into electrical signals, which are transmitted to the brain via the optic nerve. The brain interprets these signals as visual images.

Disorders of Sight

There are many disorders of sight, including refractive error, cataract, glaucoma, macular degeneration, and diabetic retinopathy. These conditions can lead to visual impairment or even blindness if not properly managed.

See Also

• Visual perception
• Visual system
• Eye disease
• Optometry
• Ophthalmology

Sight Resources
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