![]() ![]() The cornea is transparent and more curved and is linked to the larger posterior segment, composed of the vitreous, retina, choroid and the outer white shell called the sclera. The anterior segment is made up of the cornea, iris and lens. The eye is not shaped like a perfect sphere, rather it is a fused two-piece unit, composed of an anterior (front) segment and the posterior (back) segment. The front part is also called the anterior segment of the eye. A thin layer called the conjunctiva sits on top of this. The front visible part of the eye is made up of the whitish sclera, a coloured iris, and the pupil. There are six extraocular muscles that control eye movements. The eyes sit in bony cavities called the orbits, in the skull. Humans have two eyes, situated on the left and the right of the face. Three types of cells in the retina convert light energy into electrical energy used by the nervous system: rods respond to low intensity light and contribute to perception of low-resolution, black-and-white images cones respond to high intensity light and contribute to perception of high-resolution, coloured images and the recently discovered photosensitive ganglion cells respond to a full range of light intensities and contribute to adjusting the amount of light reaching the retina, to regulating and suppressing the hormone melatonin, and to entraining circadian rhythm. The remaining components of the eye keep it in its required shape, nourish and maintain it, and protect it. The retina makes a connection to the brain via the optic nerve. In order, along the optic axis, the optical components consist of a first lens (the cornea-the clear part of the eye) that accomplishes most of the focussing of light from the outside world then an aperture (the pupil) in a diaphragm (the iris-the coloured part of the eye) that controls the amount of light entering the interior of the eye then another lens (the crystalline lens) that accomplishes the remaining focussing of light into images then a light-sensitive part of the eye (the retina) where the images fall and are processed. It is approximately spherical in shape, with its outer layers, such as the outermost, white part of the eye (the sclera) and one of its inner layers (the pigmented choroid) keeping the eye essentially light tight except on the eye's optic axis. The eye can be considered as a living optical device. Then, visit an experienced optician to help you choose your glasses.The human eye is a sensory organ, part of the sensory nervous system, that reacts to visible light and allows humans to use visual information for various purposes including seeing things, keeping balance, and maintaining circadian rhythm. To help you find the perfect glasses for your face shape and coloring, first get your eyeglass prescription updated by scheduling an eye exam. SEE RELATED: Get inspired by these 7 eyewear influencers Get an expert opinion Once you have determined if you are "warm" or "cool," then you can find the eyeglass frame colors that will suit you the best.Įxamples of frame colors best for warm coloring are:įor cool coloring, the best eyeglass frame hues are: ![]() ![]() Hair colors also are considered warm or cool. Brown eyes can vary from a light cider shade (warm) through a medium-brown to a cool almost-black. Eye colorĮye colors usually are a secondary element in determining your coloring because of the many variations of eye color.įor example, blue eyes can range from a cool almost-violet to a pale blue-gray, which is warm. Olive skin is considered cool because it is a mixture of blue and yellow. Regardless of the color of your skin, skin tones are categorized as either "cool" or "warm."Ī cool complexion has blue or pink undertones, and a warm complexion has a "peaches and cream" or yellow cast. The best eyeglasses will complement the coloration of your face, eyes and hair. When choosing eyeglasses, face shape isn't the only factor that determines which frames will look best on you - your skin tone, eye color and hair color also play important roles. ![]()
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