Xerophthalmea is a term used to describe a condition in which the eyes appear dry, due to decreased tear production. It is often caused by diseases such as Sjogren’s Syndrome , or by the side effects of certain medications. Symptoms of xerophthalmea include red, itchy eyes, a burning sensation, and a feeling of having something …
Night blindness, also known as nyctalopia, is a condition in which a person has difficulty seeing in low light or at night. It is usually caused by a deficiency in vitamin A, a retinal disorder, or a problem with the optic nerve. Symptoms may include difficulty seeing in dim light, difficulty adjusting to changes in …
Eye defects can be caused by genetic conditions, environmental factors, or improper care and hygiene. They can range from minor, temporary issues to more severe, chronic problems. Common eye defects include nearsightedness, farsightedness, astigmatism, and cataracts. Nearsightedness, or myopia, is a refractive error in which objects close to the eye appear clear, but distant objects …
Eye Defects and Remedies – നേത്ര വൈകല്യങ്ങളും പരിഹാരങ്ങളും Read More »
Binocular vision is the simultaneous use of both eyes to gain visual information about the environment. It is the basis of depth perception, which allows us to perceive the world in three dimensions. Binocular vision also allows us to accurately judge distances, and to accurately track moving objects with our eyes. By combining the images …
Rhodopsin is a light-sensitive pigment that is found in the rods of the retina. It is composed of an organic molecule called retinal that is covalently bonded to the protein opsin. Rhodopsin is activated when light of a specific wavelength hits it, causing a conformational change in the molecule which triggers a photochemical reaction. This …
Cone cells are photoreceptor cells in the retina of the human eye. They are responsible for color vision and for the detection of fine detail in brightly lit settings. Cone cells come in three varieties, each of which is sensitive to a different colour of light. They are the red, green, and blue cone cells, …
Rod cells are one of two types of photoreceptors in the retina of the eye. They are responsible for scotopic vision, the ability to see in dim light. Rod cells are very sensitive and can detect even the smallest amounts of light. They are insensitive to differences in colour, and are not able to distinguish …
The retina is a light-sensitive tissue located at the back of the eye. It is composed of two types of photoreceptor cells, rods and cones, which convert light into electrical signals that are sent to the brain. Photoreceptors are specialized cells found in the eyes that are responsible for converting light into electrical signals that …
Retina and the photoreceptors – റെറ്റിനയും ഫോട്ടോറിസെപ്റ്ററുകളും Read More »
What are the peculiarities of the image formed by lens of the eye? The image formed by the lens of the eye is inverted and reversed. The image formed by the lens of the eye is focused on the retina at the back of the eye, rather than directly onto the lens itself. The image …
The formation of an image in the eye is known as retinal imaging. Light passes through the cornea and the lens of the eye and is focused onto the retina, which is a light-sensitive layer of tissue at the back of the eye. The retina contains photoreceptors, which convert the light into electrical signals that …