Symptoms and possible causes

The following are general indications.
An accurate eye examination is always necessary to diagnose correctly a disease.

Drop in vision

myopia, astigmatism, presbyopia, corneal leucoma, corneal edema, acute glaucoma, conjunctivitis, uveitis, cataract, diabetes, macular edema, retinal diseases

Red eye

foreign bodies, conjunctivitis, dyslacrimia, rosacea, keratitis, corneal abscess, scleritis, episcleritis, acute glaucoma, iatrogen

Eye pain

conjunctivitis, allergies, keratitis, dyslacrimia, uveitis, acute glaucoma, trauma, scleritis, optic disease, neuralgia

Difficulty to see far

myopia, cataracts

Difficulty to see close

hypermetropia, presbyopia

Halos around light sources

astigmatism, cataract, corneal edema

Seing deformed objects

senile macular degeneration, macular pucker

Feeling of seeing through a bubble

central serous chorioretinopathy

Flying flies

vitreous syneresis, posterior vitreous detachment

Flashes of light

posterior vitreous detachment, retinal tears, retinal detachment, migraine, cervicalgia

Permanent visual field alteration

retinal detachment, optic nerve pathologies, retinal thrombosis, neurological pathologies, glaucoma

Short-lived visual field alteration

migraine, cervicalgia

Seeing small/large

optic nerve pathology, asthenopia, migraine, cervicalgia

Seeing double with one eye

cataract

Seeing double

extraocular muscle malfunction, neurological diseases

Seeing a dark stain

hemovitreous, macular haemorrhage, retinal thrombosis, optic nerve pathology

Blurred vision

dry eye, surface inflammation, cataract, corneal leucoma, corneal edema, acute glaucoma, retinal edema, optic nerve pathology

Foreign body feeling

tear film alterations