Conjunctivitis (Pink Eye)
This is an inflammation or infection of the conjunctiva, the outer membrane of the eyeball and inner eyelid.

• Bacterial conjunctivitis involves a thick, yellow-green discharge; eyelids may be stuck together, especially upon waking.

• Viral conjunctivitis typically presents with watery discharge, often starting in one eye and spreading to the other; may accompany cold symptoms.

• Allergic conjunctivitis is characterized by itchy, watery eyes, redness, and often occurs with other allergy symptoms like sneezing or a runny nose.

• Irritant conjunctivitis results from exposure to foreign bodies, chemicals, or smoke.
  Management depends on the type: antibiotic drops or ointment for bacterial; supportive care for viral; antihistamines and allergen avoidance for allergic. Good hand hygiene is essential to prevent spread.

Strabismus (Crossed Eyes/Squint)
This means a misalignment of the eyes, where one eye turns inward, outward, upward, or downward while the other looks straight ahead.

• Esotropia is when an eye turns inward.

• Exotropia is when an eye turns outward.

• Hypertropia is when an eye turns upward.

• Hypotropia is when an eye turns downward.
  It is significant because it can lead to amblyopia (lazy eye) if not corrected.
  Management includes glasses, eye patches over the stronger eye, vision therapy exercises, or surgical correction.

Amblyopia (Lazy Eye)
This refers to reduced vision in one eye because the eye and brain are not working together properly; the eye itself may look normal, but it’s not being used effectively because the brain favors the other eye.
Common causes include strabismus, significant differences in refractive errors between the eyes, or conditions like cataracts that obstruct vision.
Management involves treating the underlying cause (e.g., glasses for refractive errors), patching the stronger eye, or using atropine drops in the stronger eye to blur its vision, thereby forcing the weaker eye to work. Early detection and intervention are crucial for optimal outcomes.

Refractive Errors
These are conditions where the shape of the eye prevents light from focusing correctly on the retina, leading to blurred vision.

• Myopia (Nearsightedness) means difficulty seeing distant objects clearly, while near vision is usually good.

• Hyperopia (Farsightedness) means difficulty seeing close objects clearly; distant objects may also be blurry in higher degrees of farsightedness.

• Astigmatism is an imperfect curvature of the cornea or lens, causing blurred or distorted vision at all distances.
  Management typically involves corrective lenses, such as eyeglasses or contact lenses.

Blocked Tear Duct (Nasolacrimal Duct Obstruction)
This is a partial or complete blockage in the tear drainage system, preventing tears from draining normally. This leads to a watery, irritated, or chronically infected eye.
Signs include a persistently watery eye, especially in the absence of crying, and sometimes a sticky discharge (mucus or pus) at the inner corner of the eye or crusting of the eyelids.
Management often includes gentle massage of the tear sac area and antibiotic eye drops if an infection is present. Most cases resolve spontaneously within the first year of life; persistent blockages may require probing or a minor surgical procedure.

Chalazion / Stye (Hordeolum)

• A chalazion is a non-infectious, typically painless, firm lump that develops in the eyelid, caused by a blocked oil gland (meibomian gland).

• A stye (hordeolum) is an acute, localized, and often tender red bump at the edge of the eyelid, usually caused by an infection of an eyelash follicle or an oil gland.
  Management for both often involves applying warm compresses several times a day to promote drainage. Styes may sometimes require topical antibiotic ointment or, rarely, incision and drainage if they don’t resolve. Chalazia may resolve on their own or require medical or surgical intervention if large or persistent.

Periorbital Cellulitis / Orbital Cellulitis

• Periorbital cellulitis (preseptal cellulitis) is an infection of the eyelid and surrounding soft tissues anterior to the orbital septum. It presents with eyelid swelling, redness, warmth, and tenderness, but eye movement and vision are typically normal.

• Orbital cellulitis is a more serious infection of the tissues posterior to the orbital septum, within the orbit itself. It involves proptosis (bulging eye), restricted or painful eye movements, decreased vision, and often fever. This is an emergency.
  Management for periorbital cellulitis often involves oral antibiotics. Orbital cellulitis requires prompt hospitalization, intravenous antibiotics, and possibly surgical drainage.