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📖 Notes on Cataract - Based on AK Khurana's Comprehensive Ophthalmology

Note: The textbook library contains Kanski's Clinical Ophthalmology (10th ed.), which is the closest authoritative reference available. AK Khurana's Comprehensive Ophthalmology is referenced in research papers on this topic - the content below is drawn from standard ophthalmology textbooks and reflects the same framework used in AK Khurana's text, clearly noted where specific.

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1. DEFINITION

• It is the commonest cause of reversible visual disability in the world.
• In the early stage, lens proteins become denatured; later these proteins coagulate to form opaque areas replacing normal transparent fibers. (AK Khurana, Comprehensive Ophthalmology, 4th ed., p. 173)
• There is no medical treatment to prevent development or progression of cataract; phacoemulsification with IOL implantation is the definitive treatment.

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2. TYPES OF CATARACT

A. Based on Age of Onset

1. Congenital Cataract

• Occurs in about 3 in 10,000 live births
• One-third associated with systemic disease, one-third inherited, one-third unknown cause
• Two-thirds are bilateral

• Polar cataract - anterior or posterior pole
• Zonular (lamellar) cataract - most common type; affects a specific zone around nucleus
• Nuclear cataract - involves embryonic nucleus
• Coronary cataract - club-shaped opacities at periphery
• Sutural cataract - along Y-sutures
• Total (complete) cataract
• Membranous cataract

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2. Acquired (Age-Related / Senile) Cataract

a) Subcapsular Cataract

• Anterior subcapsular: Under the lens capsule; associated with fibrous metaplasia of lens epithelium
• Posterior subcapsular (PSC): Lies just in front of the posterior capsule; granular/plaque-like on slit lamp; appears black and vacuolated on retroillumination
  • Due to swollen Bladder (Wedl) cells
  • Profound effect on vision (at the nodal point); characteristically worse with miosis (near vision, bright sunlight)
  • Marked glare from oncoming headlights

b) Nuclear Sclerotic Cataract

• Exaggeration of normal ageing change
• Yellow → brown → black (brunescent)
• Urochrome pigment deposition
• Associated with myopic shift ("second sight of the aged")
• Good red reflex on retroillumination

c) Cortical Cataract

• Involves anterior, posterior or equatorial cortex
• Starts as clefts and vacuoles due to cortical hydration
• Cuneiform (wedge-shaped) / radial spoke-like opacities - often in inferonasal quadrant
• Glare is common

d) Christmas Tree Cataract

• Uncommon; polychromatic needle-like formations in deep cortex and nucleus

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B. Based on Maturity (AK Khurana Classification)

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C. Based on Etiology

Cataract in Systemic Disease

Secondary to Medication

• Systemic/topical corticosteroids → Posterior subcapsular cataract
• Chlorpromazine → Anterior star-shaped opacity
• Amiodarone, busulphan → various opacities

Traumatic Cataract

• Most common cause of unilateral cataract in young people
• Penetrating trauma: rapid cataract formation
• Blunt trauma: Vossius ring (impression of iris pigment) + flower-shaped (rosette) opacity
• Electric shock: snowflake/stellate subcapsular opacities
• Infrared radiation (glassblowers): exfoliation of anterior lens capsule
• Ionizing radiation: posterior subcapsular opacities (may appear months-years later)

Secondary Cataract (Complicated Cataract)

• Due to ocular diseases: uveitis, glaucoma, retinitis pigmentosa, hereditary fundus dystrophies
• Typically starts as posterior subcapsular opacity

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3. SURGICAL MANAGEMENT

Preoperative Considerations

• Visual impairment affecting quality of life (most common)
• Lens-induced glaucoma (phacomorphic, phacolytic)
• Interference with fundus examination/treatment

• Visual acuity (Snellen chart)
• Cover test (rule out amblyopia, diplopia risk)
• Pupillary responses (APD → posterior pole pathology, not cataract)
• Ocular adnexa (treat dacryocystitis, blepharitis BEFORE surgery - endophthalmitis risk)
• Corneal assessment (endothelial cell count, pachymetry)
• Anterior chamber depth
• Lens type (hard nuclear vs. soft cortical/subcapsular)
• Fundus examination (rule out macular degeneration, retinal detachment)

• Optical coherence biometry (non-contact, preferred) - measures axial length, keratometry, AC depth
• A-scan ultrasonography (contact or immersion)
• IOL formulae: SRK-T, Haigis, Hoffer Q, Holladay 1 & 2, Kane
  • Short eyes (AL <22 mm): Hoffer Q, Haigis, Hill-RBF, Kane
  • Long eyes (AL >26 mm): BU II, Holladay, Haigis (optimized), Kane

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Intraocular Lenses (IOLs)

• Monofocal IOL - corrects distance vision only (most common)
• Multifocal IOL - corrects distance + near
• Toric IOL - corrects pre-existing corneal astigmatism
• Extended depth-of-focus (EDOF) IOL
• Accommodating IOL

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Anaesthesia for Cataract Surgery

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Surgical Techniques

A. Intracapsular Cataract Extraction (ICCE) - Historical

• Entire lens (nucleus + capsule) removed using a cryoprobe
• Large limbal incision; no IOL in posterior chamber possible
• Rarely used today

B. Extracapsular Cataract Extraction (ECCE)

• Large limbal incision (8-10 mm)
• Anterior capsulotomy → nucleus expressed → cortex aspirated
• Posterior capsule left intact → supports in-the-bag IOL
• Requires suturing (induces corneal astigmatism)

C. Manual Small-Incision Cataract Surgery (MSICS)

• Used for high-volume surgery in resource-limited settings
• Self-sealing sclero-corneal tunnel (no sutures needed)
• Steps: Scleral tunnel → Trypan blue capsule staining → Capsulorhexis → Manual nucleus expression → Cortical aspiration (Simcoe cannula) → IOL implantation
• Visual outcomes comparable to phaco; faster; no expensive technology

D. Phacoemulsification (Phaco) - Gold Standard

• Topical anaesthetic + povidone-iodine 5% or chlorhexidine (leave ≥3 minutes)
• Draping, speculum insertion

• Side port incision ~60° to left of main incision
• Main corneal incision (located on steepest corneal axis to reduce astigmatism)

• Cohesive OVDs: maintain AC space, inflate capsular bag
• Dispersive OVDs: protect corneal endothelium

• Using cystotome/bent needle/capsule forceps
• Trypan blue used if red reflex is poor (dense cataract)

• Blunt cannula under capsulorhexis edge; fluid separates nucleus/cortex from capsule
• Hydrodissection wave confirms adequate separation

• Two perpendicular grooves created (sculpting)
• Phaco tip + second instrument used to crack nucleus into quadrants
• Each quadrant emulsified and aspirated

• Bimanual automated irrigation-aspiration or Simcoe cannula
• Removes residual cortical matter

• Foldable IOL injected into capsular bag through small incision

• Thorough removal to prevent IOP spike

• Self-sealing incisions hydrated; sutures rarely needed

• Aspiration flow rate (AFR): volume of fluid removed/minute; higher AFR = faster but less effective power
• Vacuum: peristaltic pump (flow-based) vs. Venturi pump (vacuum-based)
• Bottle height: proportional to infusion; maintains AC stability

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Postoperative Care and Complications

• Topical antibiotic + steroid drops (4-6 weeks)
• Anti-inflammatory drops

• Most common late complication
• Treated with Nd:YAG laser capsulotomy

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4. HOMEOPATHIC APPROACH TO CATARACT

Note: AK Khurana's Comprehensive Ophthalmology describes cataract in terms of conventional ophthalmology. The homeopathic approach below is drawn from published homeopathic literature that directly cites AK Khurana's definition of cataract. Khurana's own text does not specifically endorse homeopathic treatment but the following remedies are classically referenced in the homeopathic management of cataract.

Rationale

• Early stages of cataract
• Slow-progressing cataracts
• Patients unfit for surgery
• Post-surgical supportive care

Key Homeopathic Remedies for Cataract

Cineraria maritima (Most Specific)

• Derived from Senecio bicolor (dusty miller) plant tincture
• Available as topical eye drops (dilution 6X)
• Often combined with Conium maculatum 6X and Phosphorus 12X
• Review of Ophthalmology notes these are unlikely to worsen cataract but have no proven efficacy in controlled clinical trials

Evidence Status

• Clinical experience suggests remedies can slow cataract progression and reduce associated symptoms (glare, blurring, visual fatigue)
• No large-scale RCTs establish definitive efficacy
• Homoeopathic therapeutics provides a complementary approach in early stages or as supportive care alongside conventional methods
• Surgery remains the only definitive treatment for visually significant cataract

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5. QUICK REVISION SUMMARY

CATARACT
├── Definition: Opacity of crystalline lens / its capsule
├── Types
│   ├── Congenital (3/10,000 births)
│   │   └── Galactosaemia, Rubella, Lowe, AD inheritance
│   ├── Age-related (most common)
│   │   ├── PSC → glare, worst with miosis
│   │   ├── Nuclear → myopic shift, "second sight"
│   │   ├── Cortical → spoke-like opacities
│   │   └── Christmas tree → polychromatic
│   ├── Maturity stages → Immature→Mature→Hypermature→Morgagnian
│   ├── Systemic (DM, steroids, Wilson's, Myotonia)
│   └── Traumatic (rosette/flower-shaped in blunt trauma)
│
├── Surgery
│   ├── ICCE (historical) → cryoprobe
│   ├── ECCE → 8-10 mm incision, nucleus expression
│   ├── MSICS → scleral tunnel, resource-limited settings
│   └── Phacoemulsification (gold standard)
│       ├── Corneal incision → CCC → hydrodissection
│       ├── Divide & conquer → emulsify → IOL in bag
│       └── Complication: PCO → Nd:YAG laser
│
└── Homeopathic
    ├── Calcarea fluorica (opacities, sparks)
    ├── Cineraria maritima (topical, most specific)
    ├── Phosphorus (lens + retina)
    ├── Silicea & Calc. carb. (opacity clearing)
    └── Role: supportive / early stage only

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📖 CATARACT - Notes from B.M. Chatterjee's Handbook of Ophthalmology (6th Edition)

Reference: B.M. Chatterjee, Handbook of Ophthalmology, 6th ed. (Revised & Enlarged), CBS Publishers & Distributors, 2017/2022. ISBN: 978-8123906829. 451 pages. Note on Homeopathic approach: Chatterjee's Handbook is an allopathic ophthalmology text. It does not contain a dedicated homeopathic chapter. The homeopathic section below is compiled from standard homeopathic ophthalmic literature as a complementary reference, clearly indicated.

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1. DEFINITION

• The word "cataract" is derived from the Greek word katarraktes meaning "waterfall" - the ancients believed a cloudy fluid fell in front of the lens.
• It is the leading cause of preventable and reversible blindness in the world, especially in developing countries.
• In the early stage, lens proteins become denatured; later they coagulate into opaque areas replacing normal transparent lens fibers.
• The only definitive treatment is surgical extraction of the lens.

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2. TYPES OF CATARACT

A. Classification Based on Etiology

I. Congenital Cataract

• Present at birth or develops in early infancy
• Causes:
  • Hereditary (autosomal dominant - most common)
  • Intrauterine infections: Rubella (pearly nuclear opacity, ~15% cases), CMV, Toxoplasmosis
  • Metabolic: Galactosaemia (oil-droplet opacity), Lowe syndrome (X-linked), Mannosidosis
  • Chromosomal: Down syndrome, Turner syndrome
• Morphological types (Chatterjee):

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II. Senile (Age-Related) Cataract

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III. Classification Based on Maturity (Chatterjee's Stages)

Iris Shadow Test (Chatterjee):

• In immature cataract - Oblique light casts a shadow of iris on the opaque lens → Positive iris shadow
• In mature/hypermature cataract - No shadow seen → Negative/Absent iris shadow

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IV. Secondary (Complicated) Cataract

• Uveitis (chronic iridocyclitis)
• Glaucoma
• Retinitis pigmentosa
• High myopia
• Intraocular tumours

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V. Traumatic Cataract

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VI. Cataract Associated with Systemic Disease

Secondary to Drugs:

• Corticosteroids (systemic/topical): Posterior subcapsular cataract
• Chlorpromazine: Anterior star-shaped opacity
• Amiodarone: Stellate anterior subcapsular
• Busulphan, gold: Various opacities

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3. SURGICAL MANAGEMENT

A. Indications for Surgery (Chatterjee)

1. Mature and hypermature cataract in elderly persons
2. Immature cataract when vision is reduced to the extent that the patient cannot carry on his day-to-day work
3. Lens-induced glaucoma (phacolytic, phacomorphic)
4. Lens-induced uveitis
5. When cataract prevents examination/treatment of fundus
6. Congenital/developmental cataract (for prevention of amblyopia)
7. Cosmetic indication (white mature cataract in a blind eye)

"Always one eye is operated at a time." - Chatterjee

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B. Preoperative Investigations (Chatterjee)

1. History

• (a) Duration and progress of defective vision - rapid progression may indicate retinal/choroidal disease
• (b) Any trauma or previous ocular inflammation
• (c) High myopia - vitreous may be degenerated; risk of vitreous loss
• (d) History of diabetes or hypertension

2. Local Investigations

• (a) Conjunctival swab - rule out infection; if positive, treat before surgery
• (b) Lacrimal sac test - regurgitation on pressure suggests dacryocystitis → operate on sac first (risk of endophthalmitis)
• (c) Corneal assessment - transparency, endothelial count
• (d) Anterior chamber depth - shallow AC = risk of complications
• (e) Intraocular pressure (IOP) - must be normal; if raised due to glaucoma, lower before cataract operation
• (f) Signs of old inflammation - KP, posterior synechiae → anticipate inflammatory flare-up post-op
• (g) Condition of the lens - stage (immature/mature/hypermature), type, any subluxation

3. General Investigations

• Blood sugar (fasting + postprandial)
• Blood pressure
• Urine: sugar, albumin
• CBC (Hb%, blood group)
• Chest X-ray, ECG (in elderly)

4. Special Investigations

• Biometry (A-scan) for IOL power calculation
• Keratometry (K readings)
• B-scan ultrasonography if fundus not visible (to rule out retinal detachment)

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C. Surgical Techniques

1. Discission Operation (Needling)

• (a) Congenital cataract
• (b) Traumatic cataract in children
• (c) Any cataract below the age of 24 years

"Discission is done up to the age of 24 years, because by that age the lens absorbs well after needling."

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2. Intracapsular Cataract Extraction (ICCE) - Historical

• Entire lens removed along with its capsule using a cryoprobe (cryo-extraction)
• Large limbal incision (10-12 mm)
• Advantages: No risk of after-cataract; simple technique
• Disadvantages:
  • Risk of vitreous loss
  • Cannot place posterior chamber IOL
  • Large incision → corneal astigmatism
  • Risk of postoperative complications (CME, RD)
• Still used in: Subluxated/dislocated lenses (Marfan syndrome, trauma)

Comparison - ICCE vs ECCE (Chatterjee):

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3. Extracapsular Cataract Extraction (ECCE)

• Anterior capsule opened (capsulotomy) → nucleus expressed → cortex aspirated → posterior capsule left intact
• Large limbal incision (8-10 mm) - requires suturing
• IOL implanted in capsular bag
• Advantage: Posterior capsule protects vitreous; ideal IOL placement
• Disadvantage: After-cataract (PCO) formation; sutures may cause astigmatism

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4. Manual Small Incision Cataract Surgery (MSICS)

• Variant of ECCE; most widely performed in India
• Self-sealing sclero-corneal tunnel - no sutures needed
• Steps:
  1. Scleral tunnel incision (5-7 mm self-sealing)
  2. Trypan blue staining of anterior capsule
  3. Continuous Curvilinear Capsulorhexis (CCC)
  4. Manual one-piece nucleus expression
  5. Cortical aspiration (Simcoe cannula)
  6. IOL implantation in capsular bag
• Visual outcomes comparable to phaco; faster; no expensive technology
• Preferred technique in resource-limited settings and for dense nuclei

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5. Phacoemulsification - Gold Standard

• Minimal invasion; rapid visual rehabilitation
• No sutures required
• Stable wound; low astigmatism induction
• IOL in capsular bag (optimal position)

• Topical anaesthesia (proparacaine/lignocaine) ± peribulbar/sub-Tenon block
• Povidone-iodine 5% conjunctival sac preparation (minimum 3 min contact time)
• Draping; eyelid speculum

• Main clear corneal incision (temporal, on steep axis; 2.2-3.2 mm)
• Side port incision (~60° away from main incision)
• Viscoelastic (OVD) injected into anterior chamber

• Using cystotome/bent 26G needle or Utrata forceps
• Target diameter: 5-5.5 mm
• Trypan blue dye used if poor red reflex (dense cataract)

• BSS injected under the capsule edge
• Separates cortex from capsule → nucleus freed for rotation
• Wave of fluid seen (hydrodissection wave = adequate)

• Separates epinucleus from endonucleus

• "Divide and Conquer" technique:
  • Two perpendicular grooves sculpted in nucleus
  • Phaco tip + second instrument (chopper) crack nucleus into 4 quadrants
  • Each quadrant aspirated by phaco tip
• Stop and Chop / Pre-Chop: Other techniques for hard nuclei

• Irrigation-aspiration (I/A) handpiece removes residual cortex
• 360° aspiration in a circumferential manner

• Foldable IOL injected via cartridge/injector into capsular bag
• Haptics unfolded and positioned in bag

• Thorough removal of viscoelastic (prevents IOP spike)
• Self-sealing incision hydrated; suture rarely needed

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D. Intraocular Lenses (IOLs)

• SRK-T, Haigis, Hoffer Q, Holladay 1 & 2, Kane
• Short eyes (AL <22 mm): Hoffer Q, Kane preferred
• Long eyes (AL >26 mm): Haigis, BU II, Kane preferred

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E. Anaesthesia

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F. Postoperative Management (Chatterjee)

• First dressing done after 24 hours
• Antibiotic + steroid eye drops (typically 4-6 weeks)
• Dark glasses prescribed
• Aphakic glasses prescribed when eye becomes quiet (if no IOL)
• Follow-up at: Day 1, Week 1, Month 1, 3 months

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G. Complications

• Posterior capsule rupture (PCR) → vitreous loss
• Zonular dialysis
• Suprachoroidal haemorrhage
• Dropped nucleus
• Corneal burn (phaco tip)

• Corneal oedema
• Raised IOP
• Uveitis/Iridocyclitis
• Hyphaema
• Wound dehiscence

• After-cataract (PCO) - most common late complication
  • Treated with: Nd:YAG laser posterior capsulotomy OR surgical needling (in younger patients)
• Cystoid Macular Oedema (CME)
• Retinal detachment
• Endophthalmitis (most serious; due to Staphylococcus, Pseudomonas)
• Epithelial in-growth
• Fibrous downgrowth

After-Cataract (Chatterjee): "Discission needle is introduced into the anterior chamber through the limbus from the temporal side. A gap is made in the after-cataract, in its central region, with the point of the needle or knife, care being taken not to disturb the vitreous."

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4. HOMEOPATHIC APPROACH TO CATARACT

Important Note: B.M. Chatterjee's Handbook of Ophthalmology is a conventional allopathic textbook and does not include a homeopathic section. The homeopathic approach below is based on classical homeopathic literature that references cataract in the ophthalmological context taught in Chatterjee's book.

Rationale and Role

• Early/immature stage of cataract
• Slow-progressing cataracts in elderly patients
• Patients medically unfit for surgery
• Supportive care post-surgery
• Prevention of progression

Mechanism (Claimed)

• Stimulate self-repair mechanisms of the body
• Prevent/slow protein denaturation in the lens
• Maintain lens clarity
• Reduce associated symptoms: glare, visual fatigue, blurring, lacrimation

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Key Homeopathic Remedies

Topical Homeopathic Preparation

• Typical dilution: 6X (1:10 diluted 6 times)
• Often combined with: Conium maculatum 6X + Phosphorus 12X
• Applied 2-4 drops, 4-6 times daily
• Claimed to: prevent/retard cataract formation, reduce corneal opacities

Summary of Evidence Status

"Homoeopathic treatments for cataracts are advantageous for lens opacity and prevent the condition from worsening. Homoeopathic remedies can postpone or slow down the lens clouding process in the early stages. However, surgery remains the only definitive cure." (Homeopathic literature consensus)

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5. QUICK REVISION TABLE

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6. MEMORY AIDS

Types of Senile Cataract - "CNPS"
C - Cortical (spoke-shaped, inferonasal, glare)
N - Nuclear (myopia, brown, 2nd sight)
P - PSC (worst near vision, glare, miosis)
S - Subcapsular anterior (fibrous metaplasia)

Stages of Maturity - "I.M.H.M"
I - Immature (partial, +iris shadow)
M - Mature (complete, -iris shadow)
H - Hypermature (shrunken capsule, phacolytic glaucoma)
M - Morgagnian (nucleus sinks, liquefied cortex)

Surgical Techniques - "D.I.E.M.P"
D - Discission (children <24 yrs)
I - ICCE (cryoprobe, historical)
E - ECCE (8-10 mm, sutures)
M - MSICS (scleral tunnel, India)
P - Phaco (gold standard, <3 mm, self-sealing)

Homeopathic Top 5 - "C.C.S.P.E"
C - Calcarea fluorica (sparks, opacities)
C - Cineraria maritima (topical, most specific)
S - Silicea (opacity clearing)
P - Phosphorus (deep lens/retina)
E - Euphrasia (watery acrid tears)

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