Visual communication involves the eye registering changes in the immediate environment
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COMMUNICATION: HSC BIOLOGY OPTION PowerPoint PPT Presentation


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Visual Communication involves the eye registering changes in the immediate environment. COMMUNICATION: HSC BIOLOGY OPTION. The outer eye:. CONJUNCTIVA. A thin, transparent mucous membrane that covers the sclera (the white of the eye). It lines the inner surfaces of the eyelids.

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COMMUNICATION: HSC BIOLOGY OPTION

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Visual communication involves the eye registering changes in the immediate environment

Visual Communication involves the eye registering changes in the immediate environment

COMMUNICATION:HSC BIOLOGY OPTION


The outer eye

The outer eye:


Conjunctiva

CONJUNCTIVA

  • A thin, transparent mucous membrane that covers the sclera (the white of the eye).

  • It lines the inner surfaces of the eyelids.

  • Tiny secretory glands in the produce tear film that lubricates and protects the eye while it moves in its socket and helps to keep it clean.

  • It covers and protects the surface of the cornea


Cornea

CORNEA

Transparent front window through which light enters the eyeball.


Sclera

SCLERA

  • The external layer of the eye continuous with the cornea.

  • The white of the eye.


Sclera1

SCLERA

  • Tough, non elastic tissue protects the delicate inner layers of the eye.

  • It helps to maintain the shape of the eyeball.

  • Attachment for the external muscles of the eye which enable the eyeball to move in the socket.


The inner eye

The inner eye:


Communication hsc biology option

LENS -

Biconcave disc

Refracts light rays & focuses them on the retina.


Communication hsc biology option

CILIARY BODY- Holds the lens in place yet allows flexible movements of the lens.Secretes the aqueous humour


Communication hsc biology option

IRIS

  • Coloured part of the eye

  • A ring of muscle with a hole in the middle (the pupil).

  • Controls size of pupil & amount of light entering eye.

  • In dim light pupil dilates to let more light in.

  • In bright light the iris tightens and the pupil contracts.


Retina

RETINA

  • The inner layer of the eye.

  • Contains photoreceptors for vision

  • Highly specialised rod & cone cells respond to light, converting light energy into nerve impulses.


Aqueous vitreous humour

Aqueous & Vitreous Humour

  • Transparent watery fluid

  • Provides nutrients for the lens & cornea.

  • Clear jelly-like substance

  • Refracts light

  • Helps maintain the shape of the eyeball


Choroid

CHOROID

  • The middle layer of the eye which extends into the iris

  • A sheet of blood vessels that carries oxygen & nutrients to the eye and remove carbon dioxide and wastes

  • Posteriorly it is black which prevents light in the eye from scattering.


Optic nerve

OPTIC NERVE

Transfers the visual signals to the brain for processing.


Bibliography

Bibliography:

  • http://www.wolfeeyeclinic.com/images/cornea.jpg

  • http://www.geocities.com/centennial3d/labelledexterior2.jpg

  • http://homepage.ntlworld.com/pshinde/index_nt_files/picture_data/sclera_dot_.jpg

  • http://www.stlukeseye.com/popups/images/Choroid.jpghttp://jbooy.files.wordpress.com/2008/10/j01retina.jpg

  • http://static.howstuffworks.com/gif/adam/images/en/retina-picture-c.jpg

  • http://fc02.deviantart.com/fs27/f/2008/042/0/0/Iris_Eye_Macro_Stock_by_zpyder.jpg

  • http://www.msstrength.com/wp-content/themes/zen/images/optic_nerve.jpg


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