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Ophthalmology is the branch of medicine and surgery that deals with the comprehensive evaluation, diagnosis, prevention, and treatment of eye disorders and visual pathways. Unlike optometry, which primarily focuses on vision correction and lens prescriptions, ophthalmology encompasses both advanced medical therapy and microsurgical intervention. 

It covers the entire anatomy and physiology of the eye, from the clear front surface (cornea) to the light-sensitive tissue at the back (retina), and the optic nerve that connects the eye to the brain. Modern ophthalmology utilises advanced laser technology and microsurgical techniques to restore sight, reduce the risk of permanent blindness from progressive diseases, and aim to preserve sight.

In India, an ophthalmologist is a specialised surgeon who has completed an MBBS followed by a three-year postgraduate degree, either an MS (Master of Surgery) or a DNB in Ophthalmology. They are medical doctors who can perform complex surgeries, such as cataract removal, corneal transplantation, glaucoma filtering procedures, and retinal repair, among others. Many pursue further fellowships in superspecialties such as vitreoretinal surgery or glaucoma management, allowing them to treat the most intricate structural issues of the eye.

An ophthalmologist is both a physician and a surgeon. Their responsibilities include:

• Comprehensive Eye Exams: Checking for refractive errors and the health of the internal eye structures. Performing slit-lamp examination, fundus, refraction, and intraocular pressure evaluation
• Surgical Interventions: Performing phacoemulsification with intraocular lens (IOL) implantation for cataracts, corneal transplantation, LASIK for vision correction, and drainage surgeries for glaucoma.
• Management of Systemic Diseases: Monitoring the eyes for signs of systemic illnesses such as high blood pressure and diabetes (diabetic retinopathy).
• Treatment of Infections: Prescribing specialised antibiotic or steroid drops for severe inflammatory conditions.
• Emergency Care: Managing trauma, chemical burns, intraocular foreign bodies, or sudden vision loss such as retinal detachment.
• Paediatric Care: Correcting "lazy eye" (amblyopia) and alignment issues (strabismus) in children.

You should book an appointment immediately if you experience:

• Sudden Vision Changes: Blurriness, double vision, or sudden vision loss. 
• Flashes and Floaters: Seeing sudden flashes of light or a shower of dark spots (floaters), which could indicate a retinal tear.
• Eye Pain or Redness: Persistent discomfort, especially if accompanied by a decrease in vision.
• Loss of Peripheral Vision: Seeing "tunnel-like" vision, which is often a silent sign of glaucoma.
• Halos Around Lights: Seeing rainbow-coloured circles around light sources at night.
• Persistent Dryness or Grittiness: A constant feeling of sand in the eye that does not improve with basic drops.

• Cataracts: Clouding of the eye's natural lens, which leads to a progressive, painless loss of vision.
• Myopia and Hyperopia: Common refractive errors; myopia (short-sightedness) makes distant objects blurry, while hyperopia (long-sightedness) affects close-up vision.
• Conjunctivitis (Pink Eye): Inflammation or infection of the outer membrane of the eyeball and the inner eyelid.
• Dry Eye: A condition in which the eyes do not produce enough quality tears to keep the eye surface lubricated.
• Diabetic Retinopathy: Damage to the blood vessels in the retina caused by poorly controlled blood sugar, which is one of the reasons.
• Blepharitis: Chronic inflammation of the eyelid margins, usually involving the part where the eyelashes grow.
• Glaucoma: A group of eye conditions that damage the optic nerve and lead to visual field defects, often caused by abnormally high pressure in the eye.
• Eye Allergy: An immune response that causes red, itchy, and watery eyes when exposed to pollen or dust.
• Retinal Detachment: An emergency situation in which the retina pulls away from the layer of blood vessels that provides it with oxygen.
• Macular Degeneration (AMD): A leading cause of vision loss in older adults, affecting the central part of the retina.
• Strabismus: A condition where the eyes do not properly align with each other when looking at an object.

Note: Serious symptoms require in-person consultation with an ophthalmologist. You may choose to consult an ophthalmologist online for day-to-day concerns, queries, and second opinions.

• Cataract Prevention: While ageing is the primary cause, wearing UV-protected sunglasses and quitting smoking can significantly delay the onset of lens clouding.
• Managing Eye Allergies: Avoid rubbing your eyes, as this releases more histamines. Use cold compresses and preservative-free artificial tears to wash away allergens.
• Conjunctivitis Care: Pink eye is highly contagious. Wash your hands frequently, change pillowcases daily, and never share towels or eye makeup during an infection.
• Relieving Dry Eye: Follow the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds to relax accommodation and reduce digital eye strain.
• Blepharitis Hygiene: Apply a warm compress to the closed eyelids for 5 minutes daily, followed by a gentle eyelid margin cleansing with preservative-free eyelid cleanser. 
• Astigmatism Awareness: If you have headaches or squint frequently to see clearly, you may have an irregularly shaped cornea (astigmatism) that requires specialised toric lenses.
• UV Protection: Ensure your sunglasses are labelled "100% UV protection" or "UV400". Prolonged sun exposure can lead to pterygium (growths on the eye) and even retinal damage.