ICD-10-CM H57.02 is grouped within Diagnostic Related Group(s) (MS-DRG v39. Physiologic anisocoria refers to an asymmetry of pupil diameter, usually less than 2mm, that is not associated with disease. Pathologic anisocoria reflects an abnormality in the musculature of the iris (iris diseases) or in the parasympathetic or sympathetic pathways that innervate the pupil. Unequal pupil size, which may represent a benign physiologic variant or a manifestation of disease.Anisocoria is a symptom of many conditions but is not a condition on its own. symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified ( R00- R94) The medical term for pupils of different sizes is anisocoria.A brain or neurological disorder affecting the specific nerves running. There are a variety of reasons your dog may have pupils that have different sizes. Anisocoria, in and of itself, is not a disease but rather a symptom of an underlying condition. injury, poisoning and certain other consequences of external causes ( S00-T88) Anisocoria, while a mouthful, is the medical term for when the pupils are two different sizes.Most often, the diameter difference is less than 0. Slight differences in pupil sizes are found in up to 1 in 5 healthy people. It gets larger in dim light and smaller in bright light. injury (trauma) of eye and orbit ( S05.-) The pupil is the black part in the center of the eye.endocrine, nutritional and metabolic diseases ( E00- E88).congenital malformations, deformations, and chromosomal abnormalities ( Q00-Q99).complications of pregnancy, childbirth and the puerperium ( O00-O9A).certain infectious and parasitic diseases ( A00-B99).certain conditions originating in the perinatal period ( P04- P96).For physiologic anisocoria, no treatment is needed. Treatment depends on identifying and addressing the underlying problem. So it's a pretty specific setting to even see it. As his eyes adjust to low lighting, both pupils get smaller and are the same size again. Neuroimaging with MRI (occasionally CT) depending on the person’s history and what is found on neuro-ophthalmic and neurologic examinations. One pupil doesn't get quite as big as the other in low lighting. Taking a careful history of symptoms, noting when they started and what other problems may be present.Ĭhecking the ability of each pupil to constrict in the presence of bright light and to dilate in the darkness. If the problem is new, the doctor will then focus on which pupil is responding differently.
When a doctor sees a patient for uneven pupil size, the first concern is to determine whether the unevenness is new or long-standing. Reaction to certain topical dilating medications (such as a pet’s eye drops, or anti-nausea or motion sickness patches such as scopolamine) that may accidentally get into one eye. This may be due to a brain aneurysm, and should be urgently evaluated in the emergency room. On the other hand, a person whose pupils are uneven when they were normal before may be experiencing a serious problem such as:Ī torn or blocked blood vessel in the neck (usually the result of head or neck trauma), which could cause a mildly droopy eyelid on the side of the smaller pupil.Ī third nerve palsy can result in the inability to move the affected eye normally, in addition to eyelid drooping (which is often significant) on the side of the larger pupil. In these cases, there are no other symptoms and both of the person’s pupils react to changes in light. This is called “physiologic anisocoria” and is normal. Slight differences between the two pupils may be present in up to 20 percent of people. In this condition, the difference between pupils is usually less than 1 mm. 2 Physiological anisocoria: About 20 of population has a slight difference in pupil size which is known as physiological anisocoria. This is to rule out eye conditions such as acute angle closure glaucoma or inflammation of the front part of the eye (uveitis or iritis). Anisocoria is a common condition, defined by a difference of 0.4 mm or more between the sizes of the pupils of the eyes. In common cases, anisocoria is usually benign and. More often than not, it is pointed out to the person by someone close to them.Īn ophthalmologist should be seen to rule out ocular causes of eye pain and pupil asymmetry, especially when vision loss or changes, redness or discharge from the eye(s) is present. Anisocoria is a condition where the two pupils are unequal in size and may not respond normally to light.
Uneven pupil size may be noticed by the person or by a health professional during an examination.