Skip to main content
ANISOCORIA
(unequal pupil size)
What is Anisocoria?
Anisocoria is simply when your eye's pupils are not the same (equal).
The pupil is an aperture created by the Iris; which dilates and constrict to regulate the amount of light entering the eye.This protect the retina(macula) from direct sunlight burns(UV trauma) that can blind the eye.
Anyone can have pupils that differ in size with no problem.In fact,epidemiologically,one out of five people have pupils that are normally of different sizes.Not withstanding the aforementioned,there may be  clinically cautions for a serious eye problems when seen.Namely;
*A Nervous system problem(tumor)
*A history of damage of the eye
*Risk of having stroke
*A viral infection
*Adie's tonic pupil(When one eye does not respond to light as well as the other pupil )
NOTE:Anisocoria is not a stand alone diagnosis ;A probe of the underlying cause(if organic ) with effective treatment  will automatically correct this condition.
SIGNS AND SYMPTOMS
People rarely realize it themselves that they have unequal pupils.They are often rectified by others(Doctors or neighbors ) or noticed by comparing old to recent photos of themselves.
As Clinicians,patients often present other related problems plus these symptoms :
*drooping eyelids(ptosis)
*problems moving eyes( ocular Akinesia)
*fever
*headache
*reduced sweating
DIAGNOSIS :
Your optometrist/ophthalmologist will will examine your pupils both in light room and dark room.this will allow him to see how your pupils respond to light.This help diagnose a normal from abnormal pupils.
TESTs:
PUPILLARY LIGHT RESPONSE :
Instrument : A pen torch (light)
This is an assessment of the pupillary light pathway,both DIRECT response and consensual response are tested.When a bright light is directed into the eye:
1.both direct (constriction of the Ipsilateral iris) and CONSENSUAL  response (constriction of the contralateral iris) occur.
⚠️The consensual response occurs because the two crossing of the fibers in the neural pathway(optic chiasma) in the brain.The nasal retina fibers cross in the chiasm,and approximately half from each protected nucleus cross in the posterior commissure.this allows a photoelectrical stimulation in the Right eye to indirectly stimulate the left eye too and vice versa.
Caution:both pupils should equally and symmetrically constrict under direct photostimulation of one eye and vice versa.(normal)
About 20% of many benign Anisocoria may be caused by asymmetric Supranuchlear inhibition of the  Edinger -Wesphal nucleus.
Look out for Fixed dilated pupil in accidental drug induced mydyiasis.Look out for drug abuse investigation of individuals proffesion or chemical that could exert such effect.pharmceutical agents such as 0.125% Pilcarpine and cocaine abuse.
RAPD(retinal Affarent Pupillary defect) Test:
This test is done to rule out the organic cause of the anisocoria(tumors,aneurysms,or an inflammation (neuritis ).
PROCEDURE:SWINGING FLASHLIGHT TEST.
The patient fixate on a distant object and then the practitioner swings a light from eye to eye several times rhythmically,taking care to illumibnate each pupil for equal length of time,about 2 to 3 seconds.
The below reactions in the picture will be seen and interpreted :

DIFFERENTIAL DIAGNOSIS  possible :
Adie's tonic pupil:pupil becomes small and does not dilate well in dark,hence pupil is larger in light and smaller in darkness.
Honers syndrome:a damage of the sympathetic pathway to the head resulting in ptosis,miosis,and facial anhidrosis(absence of sweat)
Argyl -Robertson syndrome :there are bilaterally small pupils that reduces in size on near objects (Accommodate ) but not constrict when exposed to bright light.
Argyll -Robertson syndrome

Post a Comment

Popular posts from this blog

Embryology of the human Eye

The human eye anatomically is considered as an extension of the brain.the central nervous develop from the neural tube.A thickening appears on either sides of the neural tube in its anterior part known as OPTIC PLATE.The optic plate grows as the Foetus(baby) grows towards the surface to form the OPTIC VESICLE.the two eyes develop from these two optic vesicles.the neural ectoderm and mesoderm come together to form the optic vesicles.
As the foetus grows the optic visicles invaginates from in front and below to form the OPTIC CUP. there is a line of invagination that remains open  for sometime known as the embryonic fissure.the hyloid artery enters through the fissure to provide nutrients to the developing structures.later atrophies found dissapears.
The inner layer of the retina(main) is formed by the inner layer of the optic cup whiles the outer layer develops into the pigmented epithelium.the neural ectoderm is responsible for the secretion of the jelly-like fluid called the VITREOU…

Computer Vision Syndrome

What is computer vision syndrome? Computer vision syndrome(Digital Eye Strain) is a group of eye and vision related problems that results from prolonged computer use.
Many individuals spend prolonged time on near tasks,than at far.this puts stress on the visual system resulting in many discomforts:Near Point World.This technological generation predisposes us to spend more time on screen(laptop,smartphones,tablets) than on manual tasks,the eye always under stress and forced to adapt to tasks beyond its threshold.The average teen in the United States spends more than nine hours daily on the media for entertainment(playing computer games,Facebook,movies and office Jobs),the average 13- year old checks the social media more than hundred times daily.Analytically,people spend more time on screen than time to sleep.Prolonged  stress on the eye and other organs of the body presents clinical Alerts for multiple causes;Fatigue,asthenopia  and drowsiness.

HOW DO COMPUTERS AFFECT VISION
Computer Us…

DRY EYE

What is DRY EYE? Dry eye is a condition in which a person does not have enough quality tears to lubricate and nourish the eye.Tears are necessary to maintain clarity of the cornea and nourishes the front surface of the eye to ensure clear vision. Any anormaly in the integrity of the eyes tear film,the production or drainage can result in dry eye.This condition is often chronic and mostly affects the older adults.
The  lower and the upper eyelids mechanically spread over the ocular surface through neuronally controlled blinking mechanism to wet the corner and other ocular surfaces and exits through the nasolacrimal drainage system.then into the nose.
Tears provide lubrication,nourish ocular surface to reduce the risk of infections,wash away foreign substances that accidentally fall on the eye,keeps ocular surface smooth to allow clear vision.
What is the differences between dry eye and dry eye syndrome (keratoconjunctivitis sicca )
dry eye is the general condition in which a person doe…