Visual Opticas And Perception at University Of Huddersfield | Flashcards & Summaries

Lernmaterialien für visual opticas and perception an der University of Huddersfield

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what are zonular fibres? 

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they are suspensory ligaments that attach the ciliary body to the lens

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what are the stimuluss to accommodation

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1. optical blur

2. change in eye vergence

3. tonic accommodation

induced accommodation

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what is presbyopia

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the gradual decrease in accommodative ability with age 

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optical blur can occur by 

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1. moving a target towards patient

2. placing minus lens infront of eye

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what is accommodation 

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a process in which the dioptric power of the eye changes due to contraction and relaxation of the ciliary muscle and the shape of the lens changes 

accommodation is the difference in the far point and near point of accommodation

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describe the mechanism of accommodation 

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1. ciliary muscle contracts

2. muscle moves anteriorly

3. the tension on the zonular fibres lessens 

4. lens becomes more spherical and increases in power


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what can you use to measure fusion vergence range

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1. single prism

2. prism bar 

3. Risley (variable) prism

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why is fusional vergence made? 

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to maintain single vision

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what is disparity fusional vergence? 

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vergence that is caused by retinal disparity 

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what does the fusional vergence range measure 

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it measures the ability to maintain single binocular vision in the presence of an  increasing vergence demand 

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wat does a prism dioptre represent

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it represents the deviation of light of 1cm through a prism at a distance of 1 metre 

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in binocular fixation the allignment of the eyes results from

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1. anatomical factors

2. the basic tonus of the extraocular muscles 

3. the eyes accommodative power

4. the fusion reflex 

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Beispielhafte Karteikarten für deinen visual opticas and perception Kurs an der University of Huddersfield - von Kommilitonen auf StudySmarter erstellt!

Q:

what are zonular fibres? 

A:

they are suspensory ligaments that attach the ciliary body to the lens

Q:

what are the stimuluss to accommodation

A:

1. optical blur

2. change in eye vergence

3. tonic accommodation

induced accommodation

Q:

what is presbyopia

A:

the gradual decrease in accommodative ability with age 

Q:

optical blur can occur by 

A:

1. moving a target towards patient

2. placing minus lens infront of eye

Q:

what is accommodation 

A:

a process in which the dioptric power of the eye changes due to contraction and relaxation of the ciliary muscle and the shape of the lens changes 

accommodation is the difference in the far point and near point of accommodation

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Q:

describe the mechanism of accommodation 

A:

1. ciliary muscle contracts

2. muscle moves anteriorly

3. the tension on the zonular fibres lessens 

4. lens becomes more spherical and increases in power


Q:

what can you use to measure fusion vergence range

A:

1. single prism

2. prism bar 

3. Risley (variable) prism

Q:

why is fusional vergence made? 

A:

to maintain single vision

Q:

what is disparity fusional vergence? 

A:

vergence that is caused by retinal disparity 

Q:

what does the fusional vergence range measure 

A:

it measures the ability to maintain single binocular vision in the presence of an  increasing vergence demand 

Q:

wat does a prism dioptre represent

A:

it represents the deviation of light of 1cm through a prism at a distance of 1 metre 

Q:

in binocular fixation the allignment of the eyes results from

A:

1. anatomical factors

2. the basic tonus of the extraocular muscles 

3. the eyes accommodative power

4. the fusion reflex 

visual opticas and perception

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