Eye donation is a process in which a person donates their eyes after death so that their corneas can be used for transplantation to restore vision in people with corneal blindness. It is a selfless act of giving sight to someone in need. Eye donation is a gift of sight and can help restore vision …
Presbyopia is a vision condition that typically occurs in people over the age of 40. It is caused by a decrease in the flexibility of the lens of the eye. This makes it more difficult for the eye to focus on nearby objects. Symptoms include difficulty seeing objects up close, headaches, and eye strain. Treatment …
Myopia, or nearsightedness, is a common vision condition in which distant objects appear blurred while near objects appear clear. It occurs when the eye is too long or the cornea is too curved, which prevents light from focusing properly on the retina. Symptoms include difficulty seeing faraway objects and/or squinting to see better. Myopia is …
Myopia or near sightedness – മയോപിയ അല്ലെങ്കിൽ ഹ്രസ്വദൃഷ്ടി Read More »
Hypermetropia or long sightedness is a refractive error in which distant objects are seen clearly, but close objects appear blurred. It is caused by an imperfection in the eye, where the eyeball is either too short or the cornea has too little curvature, so the light entering the eye is not focused correctly. People with …
Hypermetropia or long sightedness – ഹൈപ്പർമെട്രോപിയ അല്ലെങ്കിൽ ദീർഘദൃഷ്ടി Read More »
Reflection of light in the eyes is caused by the transparent layer of the cornea, which reflects light back out of the eye. The light is then reflected off the back of the eye, known as the retina, which is responsible for detecting the light and converting it into an electrical impulse that is sent …
Reflection of light in eyes – കണ്ണുകളിൽ പ്രകാശത്തിന്റെ പ്രതിഫലനം Read More »
Magnifying Glass: Magnifying glasses are used by people with poor vision, such as those with macular degeneration, to magnify small print in books and newspapers. Camera: Lenses are essential for cameras, as they are used to focus the light that enters the camera and produce an image. Telescopes: Telescopes use lenses to magnify distant …
Uses of lens in day to day life – ദൈനംദിന ജീവിതത്തിൽ ലെൻസിന്റെ ഉപയോഗം Read More »
Focal length is the distance from the lens to the point at which parallel rays of light converge. It is expressed in millimeters. The focal length of a lens determines the angle of view and the magnification of an object. A shorter focal length is considered a wide-angle lens, while a longer focal length is …
Principle focus is the point at which light rays coming from a single source converge after being reflected or refracted by a curved mirror or lens. It is the point of intersection of all the light rays that have passed through the lens or mirror.
The principal axis of a lens is an imaginary line that passes through the center of the lens, perpendicular to its surfaces. The principal axis defines the direction of light that passes through the lens, and is used to measure the angle of incidence and refraction of the light.
The optical center of a lens is the point in the center of the lens where the light rays that pass through the lens are not refracted. It is the point through which the light passes without any deviation or bending.