Ocular Anatomy at University Of Huddersfield | Flashcards & Summaries

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Lernmaterialien für Ocular anatomy an der University of Huddersfield

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describe lens accommodation for near objects 

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1. the eye detects optical blur

2. cilliary muscles contract

3. zonular fibres loosen

4. lens becomes thicker for more refraction of light 

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describe lends accommodation for far objects 

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1. there is no retinal blur

2. cilliary muscles relax

3. zonular fibres contract

4. lens becomes thinner 

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what is the lens thickness of an unaccommodated lens 

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3.5-5 mm

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what is the capsule of the lens made up of 

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made up of thickened basement membrane from the underlying anterior epithelium 

it has collagen fibrils and glycosaminoglycans and it is acellular

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what is the function of the capsule

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1. it is permeable to water and small solutes and proteins 

2. it acts as a reservoir for the build-up of molecules and  growth factors that regulate the lens metabolic processes 

3. Attachment site for zonular fibres

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where do zonule fibres originate from 

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pars plana and pars plicata of the ciliary body

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what are zonules, what are they made up of and what is their function

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they are microfibrils

they are made up of elastin and fibrilin 

function- offer mechanical strength

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capsule is secreted by 

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anterior epithelium

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what cell junctions does the anterior epithelium of the lens have 

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TESTE DEIN WISSEN

desmosomes and gap junctions

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TESTE DEIN WISSEN

what is the function of the anterior epithelium of the lens? 

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TESTE DEIN WISSEN

1. it secretes the capsule

2. it forms new lens fibres

3. active transport of ions and water for transparency takes place in the epithelium 

4. it is metabolically active as it transports metabolites from the aqueous humour to the lens

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what are the contents of lens fibres?

and what are they mainly made up of  

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TESTE DEIN WISSEN

1. water 

2. insoluble proteins 

3. soluble proteins they make up 80- 90%

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TESTE DEIN WISSEN

what is the function of the lens in accommodation  

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TESTE DEIN WISSEN
  • The lens can adjust its shape slightly 
  • to adjust its optical power
  •  and refract light
  • so that it focuses on the retina
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Q:

describe lens accommodation for near objects 

A:

1. the eye detects optical blur

2. cilliary muscles contract

3. zonular fibres loosen

4. lens becomes thicker for more refraction of light 

Q:

describe lends accommodation for far objects 

A:

1. there is no retinal blur

2. cilliary muscles relax

3. zonular fibres contract

4. lens becomes thinner 

Q:

what is the lens thickness of an unaccommodated lens 

A:

3.5-5 mm

Q:

what is the capsule of the lens made up of 

A:

made up of thickened basement membrane from the underlying anterior epithelium 

it has collagen fibrils and glycosaminoglycans and it is acellular

Q:

what is the function of the capsule

A:

1. it is permeable to water and small solutes and proteins 

2. it acts as a reservoir for the build-up of molecules and  growth factors that regulate the lens metabolic processes 

3. Attachment site for zonular fibres

Mehr Karteikarten anzeigen
Q:

where do zonule fibres originate from 

A:

pars plana and pars plicata of the ciliary body

Q:

what are zonules, what are they made up of and what is their function

A:

they are microfibrils

they are made up of elastin and fibrilin 

function- offer mechanical strength

Q:

capsule is secreted by 

A:

anterior epithelium

Q:

what cell junctions does the anterior epithelium of the lens have 

A:

desmosomes and gap junctions

Q:

what is the function of the anterior epithelium of the lens? 

A:

1. it secretes the capsule

2. it forms new lens fibres

3. active transport of ions and water for transparency takes place in the epithelium 

4. it is metabolically active as it transports metabolites from the aqueous humour to the lens

Q:

what are the contents of lens fibres?

and what are they mainly made up of  

A:

1. water 

2. insoluble proteins 

3. soluble proteins they make up 80- 90%

Q:

what is the function of the lens in accommodation  

A:
  • The lens can adjust its shape slightly 
  • to adjust its optical power
  •  and refract light
  • so that it focuses on the retina
Ocular anatomy

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