This week we are
looking at eye diseases or disorders at least 2.2 billion people worldwide have
some form of vision impairment or eye condition that’s about 28% of the
population. This figure doesn’t include things like dry eye or conjunctivitis or
any other condition that doesn’t affect sight, if it did the percentage would
be more like 50% of the population.
Eye diseases include any condition that affects the cornea, lens, retina, optic nerve, eyelids, or the visual pathways in the brain. Some are mild and temporary; others can cause permanent vision loss if untreated.
Eye conditions for
into one of eight categories these are the following.
Refractive
Disorders (Most Common Worldwide)
These
affect how light bends in the eye.
- Myopia (short‑sightedness)
– distant vision blurred
- Hyperopia (long‑sightedness)
– near vision blurred
- Astigmatism – uneven
focus due to irregular cornea
- Presbyopia – age‑related
loss of near focus (40+)
Treatment:
glasses, contact lenses, or refractive surgery.
Lens
Disorders
Cataracts
Clouding
of the lens causing blurred or dim vision.
- Extremely common with
age
- Treated with cataract
surgery (one of the safest surgeries worldwide
Retina
Disorders
These
affect the light‑sensitive layer at the back of the eye.
Age‑Related
Macular Degeneration (AMD)
- Damages central
vision
- Leading cause of
blindness in older adults
- Two types: dry and
wet
Diabetic
Retinopathy
- Caused by diabetes
damaging retinal blood vessels
- Can lead to blindness
if untreated
Retinal
Detachment
- Retina pulls away
from the back of the eye
- Medical emergency
- Symptoms: flashes,
floaters, curtain over vision
Macular
Hole / Macular Pucker
- Distortion or loss of
central vision
Optic
Nerve Disorders
Glaucoma
- Damage to the optic
nerve, often due to high eye pressure
- Causes gradual,
irreversible vision loss
- Requires lifelong
management
Optic
Neuritis
- Inflammation of the
optic nerve
- Often linked to
autoimmune conditions
Corneal
Disorders
Keratoconus
- Cornea thins and
bulges into a cone shape
- Causes distorted
vision
- Treated with cross‑linking,
contacts, or corneal transplant
Corneal
Ulcer
- Open sore, usually
from infection
- Painful and urgent to
treat
Eyelid & Surface
Disorders
Blepharitis
- Inflammation of eyelid margins
- Causes irritation, crusting, dryness
Conjunctivitis (Pink
Eye)
- Viral, bacterial, or allergic
- Causes redness, discharge, irritation
Dry Eye Disease
- Very common
- Caused by poor tear quality or quantity
Childhood
Eye Disorders
Amblyopia
(Lazy Eye)
- Brain favours one eye
- Treatable if caught
early
Strabismus
(Eye Turn)
- Eyes misaligned
- May require glasses,
exercises, or surgery
Rare but Serious Conditions
· Uveitis – inflammation inside
the eye
· Retinoblastoma – childhood eye
cancer
· Graves’ Eye Disease –
autoimmune swelling behind the eyes
· Idiopathic Intracranial
Hypertension – pressure on optic nerve
When it comes to our
eyes people should seek immediate help if they experience any of the following
- Sudden vision loss
- Flashes or a curtain over vision
- Severe eye pain
- Sudden double vision
- Chemical injury
These can indicate
emergencies like retinal detachment, acute glaucoma, or infection.



