Ocular Movements | Ductions | Versions | Vergences | Eye Movements
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2 سال پیش
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Ductions include the following movements:
1. Adduction
2. Abduction
3. Elevation / Supraduction
4. Depression / Infraduction
5. Intorsion
6. Extorsion
Adduction: when An inward movement of the eye towards the nose, a
medial rotation along the vertical axis is known as adduction.
Abduction: when An outward movement, a lateral rotation along the
vertical axis is known as abduction.
elevation :An upward movement or elevation along the horizontal axis is called elevation.
depression: When the eye moves down (depression) along the
horizontal axis is termed as depression.
Incycloduction (Intorsion): When the eye makes a rotatory
movement along the anteroposterior axis such that the superior
pole (12 O’clock point) rotates towards the nose is known as intorsion.
Excycloduction (Extorsion): When the eye rotates in a manner that
the 12 O’clock point rotates away from the nose is termed as extorsion.
Versions (Conjugate Movements)
These are synchronous and symmetric movements of both eyes in
the same direction. These are classified according to the direction of
binocular movements as follows:
1. Dextroversion: When both eyes are turned to the right. It is affected
by a simultaneous contraction of right lateral and left medial rectus
muscle.
2. Levoversion: When both eyes are turned towards left by contraction
of left lateral and right medial rectus.
3. Supraversion: when both eyes are rotated straight up. It is affected
by a simultaneous contraction of superior rectus and inferior oblique
of both eyes.
4. Infraversion: When both eyes are turned straight down, and is
caused by a bilateral contraction of inferior rectus and superior
oblique muscles.
5. Dextrodepression: When both eyes are turned down and to the
right. It is caused by a simultaneous contraction of right inferior
rectus and left superior oblique.
6. Dextroelevation: When both eyes are tured up and to the right. It
is caused by a simultaneous contraction of right superior rectus and
left inferior oblique.
7. Levoelevation: When both eyes are turned up and to the left , a
position achieved by a simultaneous contraction of left superior
rectus and right inferior oblique.
8. Levodepression: When both eyes are turned down and to the left .
This position is brought about by a simultaneous contraction of left
inferior rectus and right superior oblique.
9. Dextrocycloversion: When the eyes rotate along the anterioposterior
axis so that the superior pole (12 O’clock point) rotates to the right
side. This movement is brought about a simultaneous contraction
of inferior rectus and inferior oblique muscle of the right eye, and
superior rectus and the superior oblique of left eye.
10. Levocycloversion: A movement just opposite of dextrocycloversion.
VERGENCES
Vergences are disjugate, synchronous and symmetric movements of
both eyes in the opposite direction. Depending upon the direction of
movement vergences may be described as follows:
1. Convergence: It is a synchronous inward movement of both eyes
brought about by a simultaneous contraction of both medial recti.
2. Divergence: It is a simultaneous and synchronous outward movement
of both eyes brought about by a simultaneous contraction of both
lateral recti.
Chapters
00:00 Starts
00:13 Intro
00:34 Ductions
01:48 Versions
03:50 Vergences
05:48 Ends
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Ductions include the following movements:
1. Adduction
2. Abduction
3. Elevation / Supraduction
4. Depression / Infraduction
5. Intorsion
6. Extorsion
Adduction: when An inward movement of the eye towards the nose, a
medial rotation along the vertical axis is known as adduction.
Abduction: when An outward movement, a lateral rotation along the
vertical axis is known as abduction.
elevation :An upward movement or elevation along the horizontal axis is called elevation.
depression: When the eye moves down (depression) along the
horizontal axis is termed as depression.
Incycloduction (Intorsion): When the eye makes a rotatory
movement along the anteroposterior axis such that the superior
pole (12 O’clock point) rotates towards the nose is known as intorsion.
Excycloduction (Extorsion): When the eye rotates in a manner that
the 12 O’clock point rotates away from the nose is termed as extorsion.
Versions (Conjugate Movements)
These are synchronous and symmetric movements of both eyes in
the same direction. These are classified according to the direction of
binocular movements as follows:
1. Dextroversion: When both eyes are turned to the right. It is affected
by a simultaneous contraction of right lateral and left medial rectus
muscle.
2. Levoversion: When both eyes are turned towards left by contraction
of left lateral and right medial rectus.
3. Supraversion: when both eyes are rotated straight up. It is affected
by a simultaneous contraction of superior rectus and inferior oblique
of both eyes.
4. Infraversion: When both eyes are turned straight down, and is
caused by a bilateral contraction of inferior rectus and superior
oblique muscles.
5. Dextrodepression: When both eyes are turned down and to the
right. It is caused by a simultaneous contraction of right inferior
rectus and left superior oblique.
6. Dextroelevation: When both eyes are tured up and to the right. It
is caused by a simultaneous contraction of right superior rectus and
left inferior oblique.
7. Levoelevation: When both eyes are turned up and to the left , a
position achieved by a simultaneous contraction of left superior
rectus and right inferior oblique.
8. Levodepression: When both eyes are turned down and to the left .
This position is brought about by a simultaneous contraction of left
inferior rectus and right superior oblique.
9. Dextrocycloversion: When the eyes rotate along the anterioposterior
axis so that the superior pole (12 O’clock point) rotates to the right
side. This movement is brought about a simultaneous contraction
of inferior rectus and inferior oblique muscle of the right eye, and
superior rectus and the superior oblique of left eye.
10. Levocycloversion: A movement just opposite of dextrocycloversion.
VERGENCES
Vergences are disjugate, synchronous and symmetric movements of
both eyes in the opposite direction. Depending upon the direction of
movement vergences may be described as follows:
1. Convergence: It is a synchronous inward movement of both eyes
brought about by a simultaneous contraction of both medial recti.
2. Divergence: It is a simultaneous and synchronous outward movement
of both eyes brought about by a simultaneous contraction of both
lateral recti.
Chapters
00:00 Starts
00:13 Intro
00:34 Ductions
01:48 Versions
03:50 Vergences
05:48 Ends
#optometryacademy #optometrist #optometry #AkleshKumar #ophthalmologist #mcq #clinical #questions #sclera #scleritis #NEET #ulcer #Photophobia #ophthalmology #vision #eye #eyedoctor #ophthalmologist #optometry #eyes #eyesurgeon #eyecare #astigmatismo #optometrist #medicine #cataract #miopia #ceratocone #doctor #eyeballs #halloween #eyes #art #creepy #eyeball #eyeroll #scary #whiteeyes #eye #crazyeyes #creepygirl #prettygirlsdoingeyetricks #gothgirl #creepygirlsdoitbetter #artist #whiteeyedgirls #creepyeyes #girlswithwhiteeyes #spooky #stayweird #girlswhocanrolltheireyes #scaryeyes #girlswithpiercings #livingdeadgirl #spookygirl #everydayishalloween #deadchicksarecool #weirdeyes #bhfyp
2 سال پیش
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