Physiology of Ocular Movement

There are 3 planes of movement of eyeball
Vertical plane 

• Adduction - Medial rectus 
• Abduction - Lateral rectus

Horizontal plane 

• Elevation - Superior Rectus and inf. oblique
• Depression - Inferior Rectus and Superior oblique

Diagonal plane 

• Intorsion - Superior rectus and Superior oblique
• Extorsion - Inferior rectus and Inferior oblique

Normal range of eye movement

• Abduction - 60°
• Adduction - 50°
• Depression - 50°
• Elevation - 30°

Types of  ocular movement

• Saccadic movement-jerky voluntary movement from an object to another
• Pursuit movement-smooth follow movement
• Fixation movement-move the head while the gaze is fixed
• Reflex movement-oculocephalic, oculovestibular movement.

Symptoms of ocular motor system
Diplopia, squint, ptosis, defective vision,dizziness (ocular vertigo).