<unk>  is characterised by inward deviation of the eye usually due to extra-ocular muscle imbalance.
Causes include:
refractive errors
divergence insufficiency
convergence excess, these can be due to nerve, muscle, congenital or mechanical anomalies.
Unlike esotropia, fusion is possible and therefore diplopia is uncommon.
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Diseases of the human eye (H00–H59360–379)
Stye
Chalazion
Blepharitis
Entropion
Ectropion
Lagophthalmos
Blepharochalasis
Ptosis
Blepharophimosis
Xanthelasma
Trichiasis
Madarosis
Dacryoadenitis<unk> iphora
Dacryocystitis
Xerophthalmia
Exophthalmos
Enophthalmos
Orbital cellulitis
Orbital lymphoma
Periorbital cellulitis
Conjunctivitis
allergic
Pterygium
Pinguecula
Subconjunctival hemorrhage
allergic
Scleritis<unk> iscleritis
Keratitis
herpetic
acanthamoebic
fungal
Corneal ulcer
Photokeratitis
Thygeson's superficial punctate keratopathy
Corneal dystrophy
Fuchs'
Meesmann
Corneal ectasia
Keratoconus
Pellucid marginal degeneration
Keratoglobus
Terrien's marginal degeneration
Post-LASIK ectasia
Keratoconjunctivitis
sicca
Corneal neovascularization
Kayser–Fleischer ring
Haab's striae
Arcus senilis
Band keratopathy
herpetic
acanthamoebic
fungal
Fuchs'
Meesmann
Keratoconus
Pellucid marginal degeneration
Keratoglobus
Terrien's marginal degeneration
Post-LASIK ectasia
sicca
IrisCiliary body
Uveitis
Intermediate uveitis
Hyphema
Rubeosis iridis
Persistent pupillary membrane
Iridodialysis
Synechia
Choroideremia
Choroiditis
Chorioretinitis
Chorioretinitis
Cataract
Congenital cataract
Childhood cataract
Aphakia
Ectopia lentis
Congenital cataract
Childhood cataract
Retinitis
Chorioretinitis
Cytomegalovirus retinitis
Retinal detachment
Retinoschisis
Ocular ischemic syndrome / Central retinal vein occlusion
Central retinal artery occlusion
Branch retinal artery occlusion
Retinopathy
diabetic
hypertensive
Purtscher's
of prematurity
Bietti's crystalline dystrophy
Coats' disease
Macular degeneration
Retinitis pigmentosa
Retinal haemorrhage
Central serous retinopathy
Macular edema<unk> iretinal membrane (Macular pucker)
Vitelliform macular dystrophy
Leber's congenital amaurosis
Birdshot chorioretinopathy
Chorioretinitis
Cytomegalovirus retinitis
diabetic
hypertensive
Purtscher's
of prematurity
Bietti's crystalline dystrophy
Coats' disease
Glaucoma / Ocular hypertension / Primary juvenile glaucoma
Floater
Leber's hereditary optic neuropathy
Red eye
Globe rupture
Keratomycosis
Phthisis bulbi
Persistent fetal vasculature / Persistent hyperplastic primary vitreous
Persistent tunica vasculosa lentis
Familial exudative vitreoretinopathy
Optic neuritis
optic papillitis
Papilledema
Foster Kennedy syndrome
Optic atrophy
Optic disc drusen
optic papillitis
Foster Kennedy syndrome
Ischemic
anterior (AION)
posterior (PION)
Kjer's
Leber's hereditary
Toxic and nutritional
anterior (AION)
posterior (PION)
Ophthalmoparesis
Chronic progressive external ophthalmoplegia
Kearns–Sayre syndrome
Oculomotor (III)
Fourth-nerve (IV)
Sixth-nerve (VI)
Esotropia / Exotropia
Hypertropia
Heterophoria<unk> <unk> 
Cyclotropia
Brown's syndrome
Duane syndrome<unk> <unk> 
Conjugate gaze palsy
Convergence insufficiency
Internuclear ophthalmoplegia
One and a half syndrome
Refractive error
Hyperopia
Myopia
Astigmatism
Anisometropia / Aniseikonia
Presbyopia
Hyperopia
Myopia
Amblyopia
Leber's congenital amaurosis
Diplopia
Scotoma
Color blindness
Achromatopsia
Dichromacy
Monochromacy
Nyctalopia
Oguchi disease
Blindness / Vision loss / Visual impairment
Achromatopsia
Dichromacy
Monochromacy
Oguchi disease
Hemianopsia
binasal
bitemporal
homonymous
Quadrantanopia
binasal
bitemporal
homonymous
Asthenopia
Hemeralopia
Photophobia
Scintillating scotoma
Anisocoria
Argyll Robertson pupil
Marcus Gunn pupil
Adie syndrome
Miosis
Mydriasis
Cycloplegia
Parinaud's syndrome
Nystagmus
Childhood blindness
Trachoma
Onchocerciasis
Ophthalmology
Esophoria
Exophoria
Dysphoria
Agnosia
Astigmatism 
Amnesia
Sexual obsessions
Automatic behavior