Cataract Lens Opacification
Aging proteins clump inside the lens, clouding vision over time.
- ~100M: Global cataract cases (people affected worldwide)
- #1: Leading blindness cause (globally, per WHO)
- 60+: Typical patient age (years at onset)
- >95%: Surgery success rate (restored vision)
Protein clumping in the lens
Crystallin proteins aggregate and scatter incoming light.
Symptoms of opacification
Blurry vision, glare, and faded colors gradually appear.
Placeholder insight: density grading guides surgical planning.
Corneal Incision Access
A microscopic incision gives instruments entry to the eye.
- ~2.2mm: Incision width (self-sealing clear cornea)
- Topical: Anesthesia type (drops, no general anesthesia)
- Outpatient: Procedure setting (same-day discharge)
- Sutureless: Incision healing (self-sealing wound)
Clear corneal incision
Surgeon creates a small self-sealing tunnel incision.
Viscoelastic protection
A gel maintains chamber depth and protects tissues.
Ultrasonic Phacoemulsification
High-frequency vibration breaks the hard lens into small pieces.
- ~40kHz: Probe frequency (ultrasonic tip oscillation)
- 0–100%: Energy range (surgeon-adjustable power)
- 4+: Fragmentation techniques (divide-and-conquer, chop)
- 2–10min: Typical duration (depends on density)
Ultrasonic tip vibration
The titanium tip oscillates to emulsify lens material.
Energy vs. density tradeoff
Harder cataracts require more energy and more time.
Placeholder insight: excess energy raises endothelial stress.
Fragment Aspiration
Suction channels clear emulsified fragments from the eye.
- Variable: Aspiration flow (vacuum-controlled removal)
- Yes: Capsule preserved (bag kept intact for IOL)
- Irrigation: Cortical cleanup (residual matter flushed out)
- Maintained: Chamber stability (via fluidics balance)
Vacuum-driven removal
Fragments are drawn into the probe lumen and cleared.
Irrigation balance
Fluid inflow keeps the eye pressurized and stable.
IOL Implantation & Unfolding
A folded artificial lens unfolds inside the empty capsule.
- Acrylic: IOL material (foldable, biocompatible)
- ~2.2mm: Insertion incision (same tiny incision reused)
- Seconds: Unfolding time (inside capsule bag)
- Days: Vision recovery (sharp vision restored fast)
Folded lens injection
The IOL is compressed and injected through the incision.
Unfolding & centration
Haptic arms spring open, centering the lens precisely.
Placeholder insight: proper centration optimizes visual outcome.