WHICH THEORY OF COLOUR VISION MAKES THE BEST SENSE TO AN ARTIST WHY? <ul><li>We have five senses that is hearing, taste, s...
<ul><li>Light enters the eye through the pupil, travels through the cornea, the lens, and the interior of the eyeball to s...
PARTS OF THE EYE
<ul><li>PUPIL:  The opening that admits light to the eye.  </li></ul><ul><li>LENS: </li></ul><ul><li>It is also the part o...
<ul><li>AQUEOUS CHAMBER: </li></ul><ul><li>It is the cavity between the cornea and the lens. It is filled with a watery fl...
<ul><li>OPTIC DISC (OR BLIND SPOT) </li></ul><ul><li>It is the region where there are no rods and cones therefore is no vi...
<ul><li>RETINA: </li></ul><ul><li>The third layer of the eye is called the retina and it has nerve cells and two types of ...
<ul><li>CILIARY PROCESS  </li></ul><ul><li>The process which Ciliary Muscle is done is called Ciliary Process.  </li></ul>...
THEORY OF COLOUR VISION <ul><li>The retina is a complex sheet of cells and fibers at the back of the eyeball. </li></ul><u...
<ul><li>CONES are the retinal elements active in bright light or day light.  </li></ul><ul><li>RODS are the retinal elemen...
<ul><li>The Artist while paining a picture experiences the following stimulus sensation in vision </li></ul><ul><li>Colour...
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Vision

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Brief presentation on Vision

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Vision

  1. 1. WHICH THEORY OF COLOUR VISION MAKES THE BEST SENSE TO AN ARTIST WHY? <ul><li>We have five senses that is hearing, taste, smell, touch and vision </li></ul><ul><li>VISION </li></ul><ul><li>Vision is the ability to see sight. </li></ul>
  2. 2. <ul><li>Light enters the eye through the pupil, travels through the cornea, the lens, and the interior of the eyeball to strike the rod and the cone cells of the retina at the back of the eyeball. </li></ul><ul><li>The amount of the light striking the photosensitive rods and cones is automatically adjusted by reflex mechanisms that regulate the size of the pupil </li></ul>
  3. 3. PARTS OF THE EYE
  4. 4. <ul><li>PUPIL: The opening that admits light to the eye. </li></ul><ul><li>LENS: </li></ul><ul><li>It is also the part of the eye which helps brings the ray at a focus on the retina by changing its shape. The changes are termed as ACCOMMODATION . </li></ul><ul><li>Correction of accommodation problem is done by wearing glasses. </li></ul><ul><li>CORNEA: </li></ul><ul><li>It is the part of the eye which refracts or binds the majority of the light to bring them (the rays) to a flow on the retina. </li></ul>
  5. 5. <ul><li>AQUEOUS CHAMBER: </li></ul><ul><li>It is the cavity between the cornea and the lens. It is filled with a watery fluid called AQUEOUS HUMOR. It is divided into anterior chamber and Posterior Chamber. </li></ul><ul><li>FUNCTIONS : It provides Nutrients to the Cornea and Lens. </li></ul><ul><li>SCLERA: </li></ul><ul><li>There are 3 layers of the eye Sclera is the first layer of the eye which is Opaque (transparent). </li></ul><ul><li>CHOROID: </li></ul><ul><li>It is the second layer of the eye it is highly pigmented (Colour matter) and blood vessels are present in this region. </li></ul>
  6. 6. <ul><li>OPTIC DISC (OR BLIND SPOT) </li></ul><ul><li>It is the region where there are no rods and cones therefore is no vision is possible. The blind spot is the region of the retina where the nerve fibers leave and the blood vessels enters and leave the retina. </li></ul><ul><li>CONJUNTIVA </li></ul><ul><li>It lies infront of the cornea but in the centre it is absent so that the light can directly pass and fall on to the lens through the pupil. </li></ul><ul><li>CILIARY MUSCLE: </li></ul><ul><li>The Choroid (which is the second layer of the eye) when it reaches the lens it behaves like a muscle which is known as Ciliary Muscle. </li></ul>
  7. 7. <ul><li>RETINA: </li></ul><ul><li>The third layer of the eye is called the retina and it has nerve cells and two types of highly specialized photosensitive (or photoreceptors) which are highly sensitive to light they are called RODS and CONES. </li></ul><ul><li>VITROUS CHAMBER </li></ul><ul><li>It is a large cavity filled with Vitreous humor which is a semi solid jelly fluid which keeps the eye ball firm and in shape. </li></ul><ul><li>FOVEA </li></ul><ul><li>It is the part of the retina that we use in looking at objects we wish to see clearly. </li></ul><ul><li>OPTIC NERVE: </li></ul><ul><li>It is the nerve of the eye which carries impulses to the brain. </li></ul>
  8. 8. <ul><li>CILIARY PROCESS </li></ul><ul><li>The process which Ciliary Muscle is done is called Ciliary Process. </li></ul><ul><li>IRIS </li></ul><ul><li>It is the coloured part of the eye. </li></ul>
  9. 9. THEORY OF COLOUR VISION <ul><li>The retina is a complex sheet of cells and fibers at the back of the eyeball. </li></ul><ul><li>Rods and Cones </li></ul><ul><li>They are light sensitive elements of the retina. The rods are cylindrical in shape while the cone are rather tapered. The human eye contains 120 millions rods and about 6 millions cones. The rods and cones not spread uniformly over the retina. The blind spot has no rods and cones. Cones are the most numerous in a region of the retina known as fovea which contains no rods at all. It is sometimes said that we have two visual systems- a cone system and a rod system. This is known as DUPLICITY THEORY OF VISION . </li></ul>
  10. 10. <ul><li>CONES are the retinal elements active in bright light or day light. </li></ul><ul><li>RODS are the retinal elements active in very dim light. </li></ul><ul><li>Not only all the cones are responsible for the greater acuity for daylight vision. They are also the retinal elements necessary for colour vision. A colour blind person have deficiencies in their cone functioning. The rods and cones contain what are known as PHOTOSENSITIVE PIGMENTS . </li></ul><ul><li>Absorption of light energy causes the pigment molecules to change their shape. </li></ul>
  11. 11. <ul><li>The Artist while paining a picture experiences the following stimulus sensation in vision </li></ul><ul><li>Colour (Hue) </li></ul><ul><li>When we mix two colours, each absorbs a part of the spectrum and what is left to be reflected depends upon both the absorption and reflectance of the two colours. </li></ul><ul><li>EXAMPLE : The Sky is blue because it absorbs the light of different wave length except blue which is reflected. </li></ul><ul><li>WAVE LENGTH : it is the distance between the corresponding points in a sound wave or electromagnetic wave. </li></ul><ul><li>Brightness </li></ul><ul><li>Another major dimension of visual experience is brightness. The dimension of brightness extends from black to white and through various shades of gray. In short, the Clarity of an image depends on the brightness. </li></ul><ul><li>Form (Shape) </li></ul><ul><li>It is the energy projected on the retina that determines form in vision. </li></ul><ul><li>EXPLANATION : Higher the energy (light is the form of energy) more clear is the image. </li></ul>

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