The eye chart tests visual acuity Sight is the most important sense in many cultures About half of the cerebral cortex works on processing the information we receive thanks to sight PECFD E F P T O Z L P E D The ophthalmologist is a doctor who knows everything about our eyes and vision P E C F D E D F C Z P F E L O P Z D D E F P O T E C L E F O D P C T F D P L E C E O P E Z O L C F T D
iris pupil upper eyelid caruncle lower eyelid cornea lens lashes retina The visible light passing through the lens focuses on the retina and forms an upside-down image and our brain processes it and turns it right side up My eyes are a delicate and complex mechanism They notice the tiniest details and show me the big picture of the world
There are three primary colors red yellow and blue they cannot be made out of other colors By mixing these colors we get the secondary ones orange violet green snow coal cream beige lemon ochre peach saffron cadmium yellow gold burnt orange carrot sand powder pink buttermilk apricot salmon coral vermilion carmine bordeaux burgundy aquamarine mint cerulean verdigris turquoise teal ultramarine cobalt blue cornflower blue azure cherry blossom pink rose strawberry pink flamingo raspberry titian fuchsia cardinal magenta umber ivory champagne cappuccino taupe chamois terracotta cocoa chocolate sepia bistre lime sage chartreuse pistachio olive emerald jade forest khaki hunter periwinkle lavender lilac orchid violet amethyst plum eggplant iris indigo
These seven colors are the colors of the spectrum most people see when looking at the rainbow Besides spectral colors countless other hues exist They are often referred to by these common names The human eye is capable of distinguishing about 7 million variations of color On average a person can see several hundred thousand hues Some people such as visual artists are often particularly sensitive and can see several million hues Colors can appear to influence our emotions They can make us happy or sad calm us or even make us hungry For some yellow and orange increase their appetite Red attracts attention and warns about danger Blue provides a feeling of harmony and safety and green is associated with nature and health The condition when a person cannot perceive or distinguish one or more colors is called color blindness or Daltonism It is impossible to count all the colors hues and tints my eyes can see
