Entropion

in-turnedinward rolling of lower eyelidsinward-folded eyelid
Entropion is a medical condition in which the eyelid (usually the lower lid) folds inward.wikipedia
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Eyelid

eyelidspalpebralpalpebra
Entropion is a medical condition in which the eyelid (usually the lower lid) folds inward.
Entropion usually results from aging, but sometimes can be due to a congenital defect, a spastic eyelid muscle, or a scar on the inside of the lid that could be from surgery, injury, or disease. It is an asymptomatic condition that can, rarely, lead to trichiasis, which requires surgery. It mostly affects the lower lid, and is characterized by the turning inward of the lid, toward the globe.

Trachoma

sandy blightblinding trachomaEgyptian ophthalmia
Repeated cases of trachoma infection may cause scarring of the inner eyelid, which may cause entropion.
Untreated, repeated trachoma infections result in entropion (the inward turning of the eyelids), which may result in blindness due to damage to the cornea.

Epiphora (medicine)

epiphoraexcess tearingExcessive tearing
Epiphora
This can be due to ocular irritation and inflammation (including trichiasis and entropion) or an obstructed tear outflow tract which is divided according to its anatomical location (i.e. ectropion, punctal, canalicular or nasolacrimal duct obstruction).

Human eye

eyeeyeseyeball
Entropion can also create secondary pain of the eye (leading to self trauma, scarring of the eyelid, or nerve damage).
These changes contribute to the etiology of several eyelid disorders such as ectropion, entropion, dermatochalasis, and ptosis.

Chow Chow

Chowchow-chow Chow cross dog
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
The Chow Chow can suffer from entropion, glaucoma, juvenile cataracts, lymphoma, hip dysplasia, diabetes mellitus, canine pemphigus, and gastric cancer.

Shar Pei

Shar-PeiChinese Shar Peidog breed
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
A common problem is a painful eye condition, entropion, in which the eyelashes curl inward, irritating the eye.

Irish Setter

Irish settersred setterred setters
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
hip dysplasia, cancer, progressive retinal atrophy (PRA), epilepsy, entropion, hypothyroidism, hyperosteodystrophy, gastric dilatation volvulus (bloat), osteosarcoma, Von Willebrand's disease, patent ductus arteriosus, canine Leukocyte adhesion deficiency (CLAD) and celiac disease.

Neapolitan Mastiff

Mastino NapoletanoMastino dog
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
Entropion

Bullmastiff

bull mastiffBulldogsEnglish Bullmastiffs
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
Entropion, hypothyroidism affecting 2.8% of individuals,

Boxer (dog)

BoxerBoxersboxer dog
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
Entropion, a malformation of the eyelid requiring surgical correction, is occasionally seen, and some lines have a tendency toward spondylosis deformans, a fusing of the spine, or dystocia.

Welsh Springer Spaniel

Spaniel (Welsh Springer)springer spanielsWelsh Spaniel
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
Welsh Springers can be prone to entropion, which is a disorder that affects the eyelids.

Shiba Inu

dogShibashiba inus
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
Health conditions known to affect this breed are allergies, glaucoma, cataracts, hip dysplasia, entropion, and luxating patella.

Rottweiler

rottweilersblack and tanRot Weiller
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
They will also have certificates that their breeding animals do not have entropion or ectropion and that they have full and complete dentition with a scissor bite.

Cavalier King Charles Spaniel

CavalierSyringomyelia in the Cavalier King Charles Spaniel breed
These include the Akita, Pug, Chow Chow, Shar Pei, St. Bernard, Cocker Spaniel, Boxer, English Springer Spaniel, Welsh Springer Spaniel, Labrador Retriever, Cavalier King Charles Spaniel, Neapolitan Mastiff, Bull Mastiff, Great Dane, Irish Setter, Shiba Inu, Rottweiler, Poodle and particularly Bloodhound.
They include hereditary cataracts, corneal dystrophy, distichiasis, entropion, microphthalmia, progressive retinal atrophy, and retinal dysplasia.

Disease

morbidityillnessdiseases
Entropion is a medical condition in which the eyelid (usually the lower lid) folds inward.

Eyelash

eyelashesciliaryeyelashes,
It is very uncomfortable, as the eyelashes continuously rub against the cornea causing irritation.

Cornea

cornealcorneal diseasecorneal diseases
It is very uncomfortable, as the eyelashes continuously rub against the cornea causing irritation.

Genetics

geneticgeneticistgenetically
Entropion is usually caused by genetic factors.

Epiblepharon

This is different from when an extra fold of skin on the lower eyelid causes lashes to turn in towards the eye (epiblepharon).

Scar

scarringscar tissuescars
Repeated cases of trachoma infection may cause scarring of the inner eyelid, which may cause entropion.

Symptom

symptomssymptomaticnon-specific symptom
Symptoms of entropion include:

Pain

physical painacute painnociceptive pain
Redness and pain around the eye

Light

visible lightvisiblelight source
Sensitivity to light and wind