Diplopia or Double Vision Do you see double images sometimes? Excluding the self-made squinting of Eye, Getting drunk on those weekends, and tired Mondays, this sort of short timed diplopia is not a thing to worry about.
So, What is diplopia or double vision or Ghost image?
Our two eyes work mutually; the images that hit the fovea are processed by the brain.Thus the term Binocular single vision is used.In the absence of simultaneous perception of light from the same object, the binocular single image is not formed.It is the result of impaired function of Extraocular Muscles to fixate the target of the normally functioning eyes, to the object of desire.Problem with the extraocular muscle could be Mechanical(Trauma &Injury), Disorder of Motor neuron- Muscle junction(myoneural junction), Disorders of trochlear, Abducens, & Oculomotor cranial Nerve.
Binocular Diplopia:This happens as a result of misalignment of the two eyes i.e the eyes turned inwards(esotropia) and Eyes turned out(exotropia).The fovea of one eye is facing opposite to other eyes.The image reaching the fovea are different.This results in visual confusion.Brain helps by suppression of the one eye to protect diplopia.The suppression is mostly seen in childhood when a child has “strabismus”.This is why child never complains of diplopia.But this can result in amblyopia and Visual Impairment.Adults sometimes adapt to suppress one eye due to regular diplopia.
Monocular diplopia:Double vision seen only when viewing with one eye is a rare case seen in patients.Differential diagnosis is Keratoconus, lens subluxation, lesion in the anterior visual cortex.
Temporary Diplopia:It is caused by alcohol intoxication, head injuries, patient under medications like opoids, the anti-epileptic drugs, the anti-epileptic drugs, the hypnotic drug, the dissociative drugs, tired eye muscles can also cause diplopia.
Voluntary Diplopia:This is done for fun purpose mostly and is a voluntary act.while seeing objects too close to the eye, double objects are seen.Placing a finger in front of the visual field while being viewing tv screen, the finger causes the diplopia.
Causes of diplopia:
Corneal irregularities:Keratoconus cause the light entering the eye to diffract and scatter all over the retina.Corneal dystrophies too cause the appearance of ghost images.
Sjogren’s syndrome(Severe Dry Eye):Due to the insufficiency of the tear film over the corneal surface, the light scatters as soon as it touches the corneal epithelium.
Stroke, head injury, brain tumor, brain swelling or a brain aneurysm:A head injury, tumor, stroke or related condition can cause double vision that comes on suddenly. After examining you, your eye doctor may refer you to a specialist such as a neurologist or neurosurgeon for further testing and treatment.
Refractive surgery:LASIK, PRK, and other refractive surgery is done to help you see better without the help of glasses or contact lenses.The change in corneal shape or dryness causes the appearance of Ghost image.
Anteriorchamber cells/Keratic precipitates:As light enters the eye, The tiny cells particles block the light.The light is scattered in the anterior chamber.Patients with uveal tissue inflammation have ac cells all over the anterior chamber.
Cataract:Cataract cause the light to disperse due to its density.The light dispersion happens as soon as the light touches the natural crystalline lens.
Cranial nerves palsies:
3rd nerve i.e. Oculomotor which stimulates Superior Rectus, Inferior rectus, medial Rectus, Inferior oblique.
4thnerve i.e. Trochlear controls superior oblique muscle.
6thnerve i.e. Abducens controls Lateral Rectus.Thus restriction of the muscles causes the diplopia.
Note:Patients with cataract operated could see double vision due to the presence of posterior capsular opacity behind the artificial intraocular lens implanted and
Other causes like wearing of Prescription glasses in a wrong way leads to multiple image formation. Thus, Spectacles can be reason for diplopia and headache.Diplopia has a diverse range of ophthalmologic, infectious, autoimmune, neurological, and neoplastic causes.
Treatment of temporary causes is not necessary.But, If the problem persists again, Go visit your nearest Eye hospital.Ophthalmologists or optometry will begin the treatment of the underlying root cause.
Dry Eye should be treated with the Frequent installation of Artificial Teardrops.
It’s important to have a comprehensive eye exam to help determine the cause of the double vision as soon as possible.
Your eye doctor may then treat the double vision or send you to a specialist (such as a neurologist or neurosurgeon).
Treatment of brain tumors.
Surgery for Strabismus, Vision therapy or glasses with a prism.
Cranial nerve palsies can be caused by diabetes, head injury, tumor, multiple sclerosis, meningitis, high blood pressure, blockage of an artery or an aneurysm.Most cranial nerve palsies go away without treatment when the condition that caused them improves.
Keratoconus, cataract, corneal dystrophies, astigmatism need surgery and contact lens or glasses.
About the Author:Niranjan Gaire is the incharge of Rukum Eye Care Centre, Salley, Rukum and an ophthalmic assistant Of Nepal
Author: Ismael Cordero Clinical Engineer, Philadelphia, USA. Retinoscopy: Retinoscopy is the use of a retinoscope to measure a patient’s refractive error. Retinoscopy is an objective method of refraction in which the patient does not need to tell the practitioner how they see. If instead, they ask the patient questions about how she/ he sees, that […]
Eye twitch is the repetitive, involuntary spasm of eyelid muscles. It comes on suddenly and can last for a second, minute, hours, days or even longer. While it may feel as if everyone can see the twitch, most twitches are slight enough that they can’t be seen by someone simply looking at your face. Eye […]
What foods are healthy for your eyes ? Meanwhile people are busy with their daily activities, they forget to have proper dietry supplements.Proper food, balanced diet and healthy eyes are very much co-relating to each other.While world is fighting for the cause of blindness, ignorance of people to eat healthy food remains the leading creator […]