Alacrima refers to a wide spectrum of lacrimal secretory disorders that are mostly congenital in origin. Symptoms of these disorders can range from a complete absence of tears to hyposecretion of tears; symptoms of rarer disorders include a selective absence of tearing in response to emotional stimulation but a normal secretory response to mechanical stimulation.
Alacrima is usually inherited in an autosomal recessive fashion, but dominant pedigrees have been described. Mutations in the AAAS gene on chromosome band 12q13 have been described in several pedigrees with Allgrove (or triple-A) syndrome. The AAAS gene encodes a 547-amino acid protein named ALADIN (for alacrima-achalasia-adrenal insufficiency-neurologic disorder), which belongs to the family of regulatory proteins that play an important role in regulating intracellular protein transport.[1]
Etiologies can be separated into pathological mechanisms or syndromic associations. See Causes.
Patients with alacrima can have a wide spectrum of clinical presentations, from entirely asymptomatic and comfortable to presenting with debilitating symptoms of foreign body sensation, photophobia, ocular pain, and decreased visual acuity.
Parents may notice that there is a history of crying without tears since birth.
Information obtained from the history may be significant when alacrima is syndromic and associated with other findings.
Neostigmine testing can be performed as a challenge to evaluate for the presence of secondary tear production.
Dosages vary but can be calculated with this formula: [Weight (kg)/70] X 1.5 mg = dose
The patient may be reexamined 30-45 minutes later for evidence of tear production. Typically, no secondary tear production is seen in patients with alacrima.
Schirmer testing
This secretory test is used in the evaluation of patients with alacrima. Testing can be performed to test for basal secretors or for combined basal and reflex secretors. Schirmer test strips are specially prepared Whatman #41 paper, each measuring 35 mm in length and 5 mm in width. A notch is located 5 mm from the end to facilitate bending and placement in the conjunctival fornix. After placement in the fornix, tears advance via capillarity and reflect the tear production of the eye.
For basal secretor testing, a drop of topical anesthetic is placed in the conjunctival fornix. The inferior fornix should be dried with a cotton-tipped applicator. The Schirmer test strip is bent at the 5 mm notch and placed in the central lid of each eye. The strips are removed at 5 minutes, and a pen mark is placed at the junction of the wet test strip and the dry test strip. A measurement is made between the mark and the 5 mm notch. A normal value is 10 mm of wetting at 5 minutes, with lower values indicating a dry eye condition. Of asymptomatic patients, 15% have values of less than 3 mm.
For basal and reflex secretor testing, no topical anesthetic is used. The inferior fornix should be dried with a cotton-tipped applicator. The test is carried out as outlined above, and the normal median wetting approximates 15 mm, with a range of 10-30 mm. A value of less than 5 mm is abnormally low.
Conjunctival and lacrimal gland biopsy
Conjunctival and lacrimal gland biopsy specimens may be of value to identify underlying histopathologic findings.
Artificial tears are used as the primary treatment modality as often as necessary to relieve ocular discomfort.
Severe cases necessitate more viscous preparations, such as gels and ointments.
Pay particular attention to preservatives and concomitant hypersensitivity.
Petrolatum gels may be used at night.
Progressive symptoms may require sustained-release ocular inserts.
Moisture chambers at night may be attempted, but compliance in children is often poor.
Blepharoconjunctivitis may be treated with hot compresses and antibiotic drops or ointments.
Some cases of keratoconjunctivitis sicca, especially with recurrent corneal erosion or ulceration, may be ameliorated with bandage contact lenses, aggressive topical lubrication, and antibiotics (as needed).
Cases of systemic autoimmune dysfunction have been treated with neostigmine (Prostigmin).
Corneal epithelial breakdown is more likely if the cornea is anesthetic.
Attempt surgical interventions when conservative topical therapy does not relieve symptoms.
Temporary occlusion
Temporary punctal obliteration is difficult to quantitate and better achieved by punctal plugs.
If surgical obliteration is contemplated, it probably should be permanent.
Permanent occlusion
Permanent punctal occlusion should be attempted if all conservative means fail.
Inferior punctal occlusion and/or superior punctal occlusion may be attempted depending on the severity of the clinical findings.
Thermal, electrical, and laser modalities have been advocated, but the best permanent results occur when the punctum and the vertical limb of the canaliculus are obliterated.
Tarsorrhaphy
Temporary or permanent tarsorrhaphy is indicated with prolonged symptoms or evidence of ocular compromise characterized by corneal breakdown.
Dan D DeAngelis, MD, FRCSC, Assistant Professor of Ophthalmic Plastic and Reconstructive Surgery, Department of Ophthalmology and Vision Sciences, University of Toronto Faculty of Medicine; Ophthalmologist, Department of Ophthalmology and Vision Sciences, Hospital for Sick Children
Disclosure: Nothing to disclose.
Specialty Editors
Francisco Talavera, PharmD, PhD, Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference
Disclosure: Received salary from Medscape for employment. for: Medscape.
Chief Editor
Hampton Roy, Sr, MD, Associate Clinical Professor, Department of Ophthalmology, University of Arkansas for Medical Sciences
Disclosure: Nothing to disclose.
Acknowledgements
Jeff Hurwitz, MD, FRCS(C) Director of Ophthalmic Plastic Surgery, Ophthalmologist-in-Chief, Mount Sinai Hospital; Chairman, Professor, Department of Ophthalmology, University of Toronto, Canada
