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词条 Dry eye syndrome
释义

  1. Signs and symptoms

  2. Causes

     Decreased tear or excessive evaporation  Additional causes 

  3. Pathophysiology

  4. Diagnosis

  5. Prevention

  6. Treatment

     Environmental control  Rehydration   Autologous serum eye drops   Additional options  Medication  Ciclosporin  Conserving tears  Other  Surgery 

  7. Prognosis

  8. Epidemiology

  9. Synonyms

  10. Other animals

     Dogs  Cats 

  11. See also

  12. References

  13. Further reading

  14. External links

{{Infobox medical condition (new)
| name = Dry eye syndrome
| image = LG3-LRG.jpg
| alt =
| caption = Diffuse lissamine green staining in a person with severe dry eye.[1]
| synonyms = Dry eye, keratoconjunctivitis sicca, dry eye disease (DED), keratitis sicca
| field = Ophthalmology
| symptoms = Dry eyes, irritation, redness, discharge, blurred vision[2]
| complications = Cornea scarring[2]
| onset =
| duration =
| types =
| causes = Contact lenses, Meibomian gland dysfunction, allergies, pregnancy, Sjogren's syndrome, vitamin A deficiency, LASIK surgery, antihistamines, hormone replacement therapy, antidepressants[2][5][6]
| risks =
| diagnosis = Based on symptom[7]
| differential =
| prevention =
| treatment = Artificial tears, wrap around glasses, changing certain medications[2]
| medication = Ciclosporin, steroid eye drops[2]
| prognosis =
| frequency = ~20%[10]
| deaths =
}}Dry eye syndrome (DES), also known as keratoconjunctivitis sicca (KCS), is the condition of having dry eyes.[2] Other associated symptoms include irritation, redness, discharge, and easily fatigued eyes. Blurred vision may also occur.[2] The symptoms can range from mild and occasional to severe and continuous.[2] Scarring of the cornea may occur in some cases without treatment.[2]

Dry eye occurs when either the eye does not produce enough tears or when the tears evaporate too quickly.[3] This can result from contact lens use, meibomian gland dysfunction, allergies, pregnancy, Sjögren's syndrome, vitamin A deficiency, LASIK surgery, and certain medications such as antihistamines, some blood pressure medication, hormone replacement therapy, and antidepressants.[3][2][4] Chronic conjunctivitis such as from tobacco smoke exposure or infection may also lead to the condition.[3] Diagnosis is mostly based on the symptoms, though a number of other tests may be used.[5]

Treatment depends on the underlying cause.[3] Artificial tears are the usual first line treatment.[3] Wrap around glasses that fit close to the face may decrease tear evaporation.[3] Stopping or changing certain medications may help.[3] The medication ciclosporin or steroid eye drops may be used in some cases.[3] Another option is lacrimal plugs that prevent tears from draining from the surface of the eye.[3] Dry eye syndrome occasionally makes wearing contact lenses impossible.[3]

Dry eye syndrome is a common eye disease.[2] It affects 5–34% of people to some degree depending on the population looked at.[6] Among older people it affects up to 70%.[7] In China it affects about 17% of people.[8] The phrase "keratoconjunctivitis sicca" means "dryness of the cornea and conjunctiva" in Latin.[9]

{{TOC limit|3}}

Signs and symptoms

Typical symptoms of dry eye syndrome are dryness, burning[10] and a sandy-gritty eye irritation that gets worse as the day goes on.[11] Symptoms may also be described as itchy, scratchy, stinging or tired eyes.[10][12] Other symptoms are pain, redness, a pulling sensation, and pressure behind the eye.[4][10] There may be a feeling that something, such as a speck of dirt, is in the eye.[4][10] The resultant damage to the eye surface increases discomfort and sensitivity to bright light.[10] Both eyes usually are affected.[13]

There may also be a stringy discharge from the eyes. Although it may seem strange, dry eye can cause the eyes to water. This can happen because the eyes are irritated. One may experience excessive tearing in the same way as one would if something got into the eye. These reflex tears will not necessarily make the eyes feel better. This is because they are the watery type that are produced in response to injury, irritation, or emotion. They do not have the lubricating qualities necessary to prevent dry eye.[4]

Because blinking coats the eye with tears, symptoms are worsened by activities in which the rate of blinking is reduced due to prolonged use of the eyes.[10] These activities include prolonged reading, computer usage, driving, or watching television.[4][10] Symptoms increase in windy, dusty or smoky (including cigarette smoke) areas, in dry environments high altitudes including airplanes, on days with low humidity, and in areas where an air conditioner (especially in a car), fan, heater, or even a hair dryer is being used.[4][10][11][13] Symptoms reduce during cool, rainy, or foggy weather and in humid places, such as in the shower.[10]

Most people who have dry eyes experience mild irritation with no long-term effects. However, if the condition is left untreated or becomes severe, it can produce complications that can cause eye damage, resulting in impaired vision or (rarely) in the loss of vision.[4]

Symptom assessment is a key component of dry eye diagnosis – to the extent that many believe dry eye syndrome to be a symptom-based disease. Several questionnaires have been developed to determine a score that would allow for dry eye diagnosis. The McMonnies & Ho dry eye questionnaire is often used in clinical studies of dry eyes.[14]

Causes

Any abnormality of any one of the three layers of tears produces an unstable tear film, resulting in symptoms of dry eyes.[11]

Decreased tear or excessive evaporation

Keratoconjunctivitis sicca is usually due to inadequate tear production from lacrimal hyposecretion or to excessive tear evaporation.[10][11] The aqueous tear layer is affected, resulting in aqueous tear deficiency (ATD).[11] The lacrimal gland does not produce sufficient tears to keep the entire conjunctiva and cornea covered by a complete layer.[10] This usually occurs in people who are otherwise healthy. Increased age is associated with decreased tearing.[11] This is the most common type found in postmenopausal women.[10][15]

Causes include idiopathic, congenital alacrima, xerophthalmia, lacrimal gland ablation, and sensory denervation.[11] In rare cases, it may be a symptom of collagen vascular diseases, including relapsing polychondritis, rheumatoid arthritis, granulomatosis with polyangiitis, and systemic lupus erythematosus.[10][11][16][17] Sjögren's syndrome and other autoimmune diseases are associated with aqueous tear deficiency.[10][11] Drugs such as isotretinoin, sedatives, diuretics, tricyclic antidepressants, antihypertensives, oral contraceptives, antihistamines, nasal decongestants, beta-blockers, phenothiazines, atropine, and pain relieving opiates such as morphine can cause or worsen this condition.[4][10][11][13] Infiltration of the lacrimal glands by sarcoidosis or tumors, or postradiation fibrosis of the lacrimal glands can also cause this condition.[11] Recent attention has been paid to the composition of tears in normal or dry eye individuals. Only a small fraction of the estimated 1543 proteins in tears are differentially deficient or upregulated in dry eye, one of which is lacritin.[18][19] Topical lacritin promotes tearing in rabbit preclinical studies.[20] Also, topical treatment of eyes of dry eye mice (Aire knockout mouse model of dry eye) restored tearing, and suppressed both corneal staining and the size of inflammatory foci in lacrimal glands.[21]

Additional causes

Aging is one of the most common causes of dry eyes because tear production decreases with age.[4] Several classes of medications (both prescription and OTC) have been hypothesized as a major cause of dry eye, especially in the elderly. Particularly, anticholinergic medications that also cause dry mouth are believed to promote dry eye.[22] Dry eye may also be caused by thermal or chemical burns, or (in epidemic cases) by adenoviruses.   A number of studies have found that diabetics are at increased risk for the disease.[23][24]

About half of all people who wear contact lenses complain of dry eyes.[4] There are two potential connections between contact usage and dry eye. Traditionally, it was believed that soft contact lenses, which float on the tear film that covers the cornea, absorb the tears in the eyes.[4] The connection between a loss in nerve sensitivity and tear production is also the subject of current research.[25]

Dry eyes also occurs or gets worse after LASIK and other refractive surgeries, in which the corneal nerves are cut during the creation of a corneal flap.[4] The corneal nerves stimulate tear secretion.[4] Dry eyes caused by these procedures usually resolves after several months, but it can be permanent.[13] Persons who are thinking about refractive surgery should consider this.[4]

An eye injury or other problem with the eyes or eyelids, such as bulging eyes or a drooping eyelid can cause keratoconjunctivitis sicca.[12] Disorders of the eyelid can impair the complex blinking motion required to spread tears.[13]

Abnormalities of the lipid tear layer caused by blepharitis and rosacea, and abnormalities of the mucin tear layer caused by vitamin A deficiency, trachoma, diphtheric keratoconjunctivitis, mucocutaneous disorders and certain topical medications are causes of keratoconjunctivitis sicca.[11]

Persons with keratoconjunctivitis sicca have elevated levels of tear nerve growth factor (NGF).[11] It is possible that this ocular surface NGF plays an important role in ocular surface inflammation associated with dry eyes.[11]

Pathophysiology

Having dry eyes for a while can lead to tiny abrasions on the surface of the eyes.[12] In advanced cases, the epithelium undergoes pathologic changes, namely squamous metaplasia and loss of goblet cells.[11] Some severe cases result in thickening of the corneal surface, corneal erosion, punctate keratopathy, epithelial defects, corneal ulceration (sterile and infected), corneal neovascularization, corneal scarring, corneal thinning, and even corneal perforation.[10][11]

Another contributing factor may be lacritin monomer deficiency. Lacritin monomer, active form of lacritin, is selectively decreased in aqueous deficient dry eye, Sjogren's syndrome dry eye, contact lens-related dry eye and in blepharitis.[19]

Diagnosis

Dry eyes can usually be diagnosed by the symptoms alone.[10] Tests can determine both the quantity and the quality of the tears.[13] A slit lamp examination can be performed to diagnose dry eyes and to document any damage to the eye.[10][11]

A Schirmer's test can measure the amount of moisture bathing the eye.[10] This test is useful for determining the severity of the condition.[4] A five-minute Schirmer's test with and without anesthesia using a Whatman #41 filter paper 5 mm wide by 35 mm long is performed. For this test, wetting under 5 mm with or without anesthesia is considered diagnostic for dry eyes.[11]

If the results for the Schirmer's test are abnormal, a Schirmer II test can be performed to measure reflex secretion. In this test, the nasal mucosa is irritated with a cotton-tipped applicator, after which tear production is measured with a Whatman #41 filter paper. For this test, wetting under 15 mm after five minutes is considered abnormal.[11]

A tear breakup time (TBUT) test measures the time it takes for tears to break up in the eye.[4] The tear breakup time can be determined after placing a drop of fluorescein in the cul-de-sac.[11]

A tear protein analysis test measures the lysozyme contained within tears. In tears, lysozyme accounts for approximately 20 to 40 percent of total protein content.[11]

A lactoferrin analysis test provides good correlation with other tests.[11]

The presence of the recently described molecule Ap4A, naturally occurring in tears, is abnormally high in different states of ocular dryness. This molecule can be quantified biochemically simply by taking a tear sample with a plain Schirmer test. Utilizing this technique it is possible to determine the concentrations of Ap4A in the tears of patients and in such way diagnose objectively if the samples are indicative of dry eye.[26]

The Tear Osmolarity Test has been proposed as a test for dry eye disease.[27] Tear osmolarity may be a more sensitive method of diagnosing and grading the severity of dry eye compared to corneal and conjunctival staining, tear break-up time, Schirmer test, and meibomian gland grading.[28] Others have recently questioned the utility of tear osmolarity in monitoring dry eye treatment.[19]

Prevention

Avoiding refractive surgery (LASIK & PRK), limiting contact lens use, limiting computer screen use, avoiding environmental conditions and refrain from using certain antihistamines which can increase prevalence of symptoms.[29] Complications can be prevented by use of wetting and lubricating drops and ointments.[30]

Treatment

A variety of approaches can be taken to treatment. These can be summarised as: avoidance of exacerbating factors, tear stimulation and supplementation, increasing tear retention, and eyelid cleansing and treatment of eye inflammation.[31]

Dry eyes can be exacerbated by smoky environments, dust and air conditioning and by our natural tendency to reduce our blink rate when concentrating. Purposefully blinking, especially during computer use and resting tired eyes are basic steps that can be taken to minimise discomfort.[31] Rubbing one's eyes can irritate them further, so should be avoided.[13] Conditions such as blepharitis can often co-exist and paying particular attention to cleaning the eyelids morning and night with mild soaps and warm compresses can improve both conditions.[31]

Environmental control

Dry, drafty environments and those with smoke and dust should be avoided.[10] This includes avoiding hair dryers, heaters, air conditioners or fans, especially when these devices are directed toward the eyes. Wearing glasses or directing gaze downward, for example, by lowering computer screens can be helpful to protect the eyes when aggravating environmental factors cannot be avoided.[13] Using a humidifier, especially in the winter, can help by adding moisture to the dry indoor air.[10][12][13][31]

Rehydration

For mild and moderate cases, supplemental lubrication is the most important part of treatment.[11]

Application of artificial tears every few hours[10] can provide temporary relief. Additional research is necessary to determine whether certain artificial tear formulations are superior to others in treating dry eye.[32]

Autologous serum eye drops

A 2017 Cochrane review found mixed results when comparing autologous serum eye drops to artificial tears or saline.[33] Evidence from the examined trials showed that autologous serum eye drops may have a small short-term benefit when compared to artificial tears, but there is no evidence of improvement after 2 weeks.[33]

Additional options

Lubricating tear ointments can be used during the day, but they generally are used at bedtime due to poor vision after application.[11] They contain white petrolatum, mineral oil, and similar lubricants.[11] They serve as a lubricant and an emollient.[11] Application requires pulling down the lower eyelid and applying a small amount (0.25 in) inside.[11] Depending on the severity of the condition, it may be applied from every hour to just at bedtime.[11] It should never be used with contact lenses.[11] Specially designed glasses that form a moisture chamber around the eye may be used to create additional humidity.[13]

Medication

Inflammation occurring in response to tears film hypertonicity can be suppressed by mild topical steroids or with topical immunosuppressants such as ciclosporin (Restasis).[34][35] Elevated levels of tear NGF can be decreased with 0.1% prednisolone.[11]

Diquafosol, an agonist of the P2Y2 purinogenic receptor, is approved in Japan for managing dry eye disease by promoting tear secretion.

Lifitegrast is a new drug that was approved by the FDA for the treatment of the condition in 2016.[36]

Ciclosporin

Topical ciclosporin (topical ciclosporin A, tCSA) 0.05% ophthalmic emulsion is an immunosuppressant.[11] The drug decreases surface inflammation.[13] In a trial involving 1200 people, Restasis increased tear production in 15% of people, compared to 5% with placebo.[4]

It should not be used while wearing contact lenses,[11] during eye infections[4] or in people with a history of herpes virus infections.[13] Side effects include burning sensation (common),[4] redness, discharge, watery eyes, eye pain, foreign body sensation, itching, stinging, and blurred vision.[11][4] Long term use of ciclosporin at high doses is associated with an increased risk of cancer.[37][38]

Cheaper generic alternatives are available in some countries.[39]

Conserving tears

There are methods that allow both natural and artificial tears to stay longer.[13]

In each eye, there are two puncta[40] – little openings that drain tears into the tear ducts.[4] There are methods to partially or completely close the tear ducts.[13] This blocks the flow of tears into the nose, and thus more tears are available to the eyes.[10] Drainage into either one or both puncta in each eye can be blocked.

Punctal plugs are inserted into the puncta to block tear drainage.[4] It is not clear if punctual plugs are effective at reducing dry eye syndrome symptoms.[174] Punctual plugs are thought to be "relatively safe", however their use may result in epiphora (watery eyes), and more rarely, serious infection and swelling of the tear sac where the tears drain.[174] They are reserved for people with moderate or severe dry eye when other medical treatment has not been adequate.[4]

If punctal plugs are effective, thermal[13] or electric[11] cauterization of puncti can be performed. In thermal cauterization, a local anesthetic is used, and then a hot wire is applied.[13] This shrinks the drainage area tissues and causes scarring, which closes the tear duct.[13]

Other

Heating systems that try to unblock the oil glands in the eye has some preliminary evidence of benefit.[41]

Surgery

In severe cases of dry eyes, tarsorrhaphy may be performed where the eyelids are partially sewn together. This reduces the palpebral fissure (eyelid separation), ideally leading to a reduction in tear evaporation.[10]

Prognosis

Keratoconjunctivitis sicca usually is a chronic problem.[13] Its prognosis shows considerable variance, depending upon the severity of the condition. Most people have mild-to-moderate cases, and can be treated symptomatically with lubricants. This provides an adequate relief of symptoms.[11]

When dry eyes symptoms are severe, they can interfere with quality of life.[4] People sometimes feel their vision blurs with use, or severe irritation to the point that they have trouble keeping their eyes open or they may not be able to work or drive.[10][4]

Epidemiology

Keratoconjunctivitis sicca is relatively common within the United States, especially so in older patients.[11] Specifically, the persons most likely to be affected by dry eyes are those aged 40 or older.[13] 10-20% of adults experience Keratoconjunctivitis sicca.[42] Approximately 1 to 4 million adults (age 65-84) in the USA are effected.[42]

While persons with autoimmune diseases have a high likelihood of having dry eyes, most persons with dry eyes do not have an autoimmune disease.[13] Instances of Sjögren syndrome and keratoconjunctivitis sicca associated with it are present much more commonly in women, with a ratio of 9:1. In addition, milder forms of keratoconjunctivitis sicca also are more common in women.[11] This is partly because hormonal changes, such as those that occur in pregnancy, menstruation, and menopause, can decrease tear production.[4][13]

In areas of the world where malnutrition is common, vitamin A deficiency is a common cause. This is rare in the United States.[30]

Racial predilections do not exist for this disease.[11]

Synonyms

Other names for dry eye include dry eye syndrome, keratoconjunctivitis sicca (KCS), dysfunctional tear syndrome, lacrimal keratoconjunctivitis, evaporative tear deficiency, aqueous tear deficiency, and LASIK-induced neurotrophic epitheliopathy (LNE).[3]

Other animals

Among other animals, keratoconjunctivitis sicca occurs in dogs, cats, and horses.[43]

Dogs

Keratoconjunctivitis sicca is common in dogs. Most cases are caused by a genetic predisposition, but chronic conjunctivitis, canine distemper, and drugs such as sulfasalazine and trimethoprim-sulfonamide also cause the disease.[44] Symptoms include eye redness, a yellow or greenish discharge, ulceration of the cornea, pigmented cornea, and blood vessels on the cornea. Diagnosis is made by measuring tear production with a Schirmer tear test. Less than 15 milliliters of tears produced in a minute is abnormal.[44]

Tear replacers are a mainstay of treatment, preferably containing methylcellulose or carboxymethyl cellulose.[44] Ciclosporin stimulates tear production and acts as a suppressant on the immune-mediated processes that cause the disease. Topical antibiotics and corticosteroids are sometimes used to treat secondary infections and inflammation. A surgery known as parotid duct transposition is used in some extreme cases where medical treatment has not helped. This redirects the duct from the parotid salivary gland to the eye. Saliva replaces the tears. Dogs suffering from cherry eye should have the condition corrected to help prevent this disease.

Commonly affected breeds include:

  • Cavalier King Charles Spaniel
  • Bulldog
  • Chinese Shar-Pei
  • Lhasa Apso
  • Shih Tzu
  • West Highland White Terrier
  • Pug
  • Bloodhound
  • Cocker Spaniel
  • Pekingese
  • Boston Terrier
  • Miniature Schnauzer
  • Samoyed[44]

Cats

Keratoconjunctivitis sicca is uncommon in cats. Most cases seem to be caused by chronic conjunctivitis, especially secondary to feline herpesvirus.[44] Diagnosis, symptoms, and treatment are similar to those for dogs.

See also

{{Portal|Medicine}}
  • Conjunctivochalasis

References

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Further reading

  • {{cite book |title = Reversing Dry Eye Syndrome: Practical Ways to Improve Your Comfort, Vision, and Appearance |url= http://yalepress.yale.edu/yupbooks/book.asp?isbn=9780300122855 |last=Maskin |first= Steven L. |date=2007-05-28 |publisher= Yale University Press |isbn= 978-0-300-12285-5}}
  • {{cite book |title= The Dry Eye Remedy: The Complete Guide to Restoring the Health and Beauty of Your Eyes |url= http://www.hatherleighpress.com/catalog/display.pperl?isbn=9781578262427 |last= Latkany |first= Robert |date= 2007-04-03 |publisher= Hatherleigh Press |isbn= 978-1-57826-242-7 |deadurl= yes |archiveurl= https://web.archive.org/web/20111006022642/http://www.hatherleighpress.com/catalog/display.pperl?isbn=9781578262427 |archivedate= 2011-10-06 |df= }}
  • {{cite book |title= The Dry Eye: A Practical Approach |url= http://www.elsevier.com/wps/find/bookdescription.cws_home/691352/description |last= Patel |first= Sudi |author2=Blades, Kenny |date= 2003-04-10 |publisher= Butterworth-Heinemann |isbn= 978-0-7506-4978-0}}
  • {{cite book |title= Surgery for the Dry Eye: Scientific Evidence and Guidelines for the Clinical Management of Dry Eye Associated Ocular Surface Disease |url= http://content.karger.com/ProdukteDB/produkte.asp?Aktion=showproducts&ProduktNr=233654&searchWhat=books |first= Gerd |last= Geerling |author2=Brewitt, Horst | date=June 2008 |publisher= S. Karger AG |isbn= 978-3-8055-8376-3}}
  • {{cite book |title= Dry Eye Disease: The Clinician's Guide to Diagnosis And Treatment |url= http://www.thieme.com/SID2461381338406/productsubpages/pubid1077311477.html |first= Penny A. |last= Asbell |author2= Lemp, Michael A. |date= November 2006 |publisher= Thieme Medical Publishers |isbn= 978-1-58890-412-6 |deadurl= yes |archiveurl= https://web.archive.org/web/20090924040204/http://www.thieme.com/SID2461381338406/productsubpages/pubid1077311477.html |archivedate= 2009-09-24 |df= }}

External links

{{Medical resources
| DiseasesDB =
| ICD10 = {{ICD10|H|19|3|h|15}}
| ICD9 = {{ICD9|370.33}}
| ICDO =
| OMIM =
| MedlinePlus = 000426
| eMedicineSubj = article
| eMedicineTopic = 1196733
| eMedicine_mult = {{eMedicine2|article|1210417}}
| MeshID = D007638
}}
  • [https://nei.nih.gov/health/cornealdisease Facts About the Cornea and Corneal Disease] The National Eye Institute (NEI).
  • Dry Eye Syndrome on NHS Choices
  • Am.J.Managed Care - Dry Eye Disease: Pathophysiology, Classification, and Diagnosis
  • Dry Eye Syndrome on eMedicine
  • Dry Eye (Keratoconjunctivitis Sicca) from The Pet Health Library
  • Nasolacrimal and Lacrimal Apparatus, The Merck Veterinary Manual
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