Ptosis,phylectenular conjunctivitis, detachment of ratina give answers in short

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I now have sufficient information from authoritative textbooks. Here is a concise but complete answer:

1. Ptosis

Definition: Drooping of the upper eyelid - the upper lid margin falls below its normal position (normally covers the superior 2 mm of cornea).

Classification

Type	Cause	Examples
Neurogenic	Innervational defect	3rd nerve palsy, Horner syndrome (sympathetic - only 2-3 mm ptosis + miosis)
Myogenic	Levator muscle / NMJ defect	Myasthenia gravis (fluctuates, worse at day's end), myotonic dystrophy, PEO
Aponeurotic (Involutional)	Defect in levator aponeurosis	Most common acquired type; elderly
Mechanical	Mass or scarring	Lid tumour, chalazion, oedema
Congenital	Levator dysplasia	Unilateral or bilateral; Marcus Gunn jaw-winking

Pseudoptosis (False Ptosis)

Contralateral lid retraction
Enophthalmos / phthisis bulbi / artificial eye (no globe support)
Ipsilateral hypotropia
Brow ptosis

Key Clinical Points

Measure palpebral fissure height and levator function (MRD1)
Amblyopia risk in children if visual axis is occluded
Management: Surgery (levator resection / aponeurosis repair / frontalis sling depending on levator function)

2. Phlyctenular Conjunctivitis

Definition: A delayed-type (Type IV) hypersensitivity reaction of the conjunctiva (and sometimes cornea) to microbial antigens.

Aetiology

Most common cause worldwide: Mycobacterium tuberculosis (TB protein antigen)
Other causes: Staphylococcal antigen (blepharitis-related), Candida, Chlamydia
Also seen in primary TB infection (part of primary complex)

Clinical Features

Small, pinkish-white nodule (phlycten) at the limbus or on bulbar conjunctiva
Surrounded by dilated conjunctival vessels
Can migrate onto cornea (phlyctenular keratoconjunctivitis) - leaves a triangular scar with vascularization
Symptoms: lacrimation, photophobia, foreign body sensation, redness

Treatment

Topical corticosteroids (e.g., prednisolone drops) - primary treatment
Treat underlying cause (anti-TB therapy if TB-related; lid hygiene + topical antibiotics if staph-related)

3. Retinal Detachment (RD)

Definition: Separation of the neurosensory retina from the retinal pigment epithelium (RPE).

Types

1. Rhegmatogenous RD (most common)

Due to a full-thickness break/tear in the retina
Liquefied vitreous enters the subretinal space through the tear
Risk factors: myopia, trauma, prior cataract surgery, lattice degeneration, age >60
Mechanism: vitreous collapse -> traction on retina -> tear -> fluid enters behind retina

2. Tractional RD

Fibrovascular membranes pull the retina off without a break
Causes: proliferative diabetic retinopathy, sickle cell disease, ROP

3. Exudative (Non-rhegmatogenous) RD

No retinal break; fluid accumulates under retina from RPE damage or leakage
Causes: malignant hypertension, choroidal tumors, uveitis, choroidal metastases

Symptoms

Floaters (vitreous debris/blood)
Flashing lights (photopsia - vitreous traction on retina)
Peripheral field defect/curtain (scotoma corresponding to the detachment)
If fovea involved: reduced visual acuity + afferent pupil defect

Investigations

Dilated fundoscopy (gold standard)
B-scan ultrasound (if media opacity obscures view)
OCT (identifies tractional membranes)

Treatment

Situation	Management
Macula-on RRD	Urgent surgery (within hours-days)
Macula-off RRD	Repair within 7-10 days (no significant visual benefit beyond this)
Chronic macula-off	Repair within 1 week if possible
Tractional RD	Vitrectomy ± membrane peel
Exudative RD	Treat underlying cause

Surgical options: Laser photocoagulation, cryotherapy, pneumatic retinopexy, scleral buckle, pars plana vitrectomy (PPV).

Sources: Kanski's Clinical Ophthalmology 10e; Harrison's Principles of Internal Medicine 22e; Robbins & Kumar Basic Pathology; The Wills Eye Manual; Robbins Pathology

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