Manual Small Incision Cataract Surgery (MSICS) is a sutureless surgical technique in which the cataract is removed in one piece through a carefully constructed self-sealing scleral tunnel. It is a workhorse of modern Indian cataract surgery — particularly valuable for very hard, brunescent or complex cataracts where forcing phacoemulsification would risk excessive ultrasound energy and corneal damage.

How MSICS Works — Step by Step

1. Anaesthesia

Usually a peribulbar or sub-Tenon block to numb the eye and immobilise it briefly. Topical anaesthesia is occasionally used in selected cases.

2. Conjunctival peritomy

A small flap of conjunctiva is reflected to expose the sclera at the planned tunnel site (usually superiorly).

3. Scleral tunnel construction

A frown- or straight-shaped tunnel about 6 mm wide is dissected within the sclera and extended into clear cornea. The shape and depth of the tunnel are critical — they determine self-sealing behaviour.

4. Capsulorhexis or capsulotomy

A circular opening is created in the front capsule of the lens — large enough to allow the whole nucleus to be delivered.

5. Hydrodissection and nucleus prolapse

Fluid is gently injected to free the nucleus from the cortex. The nucleus is then manoeuvred into the anterior chamber.

6. Nucleus delivery

The whole nucleus is delivered through the scleral tunnel using a wire vectis, irrigating Sinskey hook, sandwich technique or visco-expression — depending on the surgeon’s preference and the specific case.

7. Cortical clean-up

Soft cortical material is aspirated, leaving a clean capsular bag.

8. IOL implantation

A foldable IOL — same modern hydrophobic acrylic lenses we use for phaco — is placed in the bag through the tunnel. The wider tunnel also allows rigid PMMA IOLs in cases where this is preferred.

9. Closure

The tunnel is checked for self-sealing. The conjunctival flap is repositioned. No corneal stitch is needed in standard cases.

Why MSICS Is Sometimes the Better Choice

• Very hard, brunescent or rock-hard cataracts — phaco would require prolonged ultrasound that could damage the corneal endothelium
• Mature white or hypermature cataracts — capsule may be fragile, and removing the nucleus whole protects the posterior capsule
• Compromised corneal endothelium — Fuchs dystrophy, prior surgery, low cell counts
• Pseudoexfoliation with weak zonules — gentler intraocular dynamics
• Phaco-fatigued eyes — patients with limited cooperation under topical anaesthesia
• Selected complicated cataracts — where larger working space is desirable

Recovery

• Day-care procedure — home the same day
• Antibiotic and anti-inflammatory eye drops for 4 weeks
• Vision typically clears within 3–7 days; final vision by 4 weeks
• Mild astigmatism from the larger tunnel is expected and usually settles or is corrected with glasses
• Avoid eye rubbing and dust for 2 weeks

MSICS vs Phacoemulsification — How We Decide

The decision between phaco and MSICS is made by the surgeon during your consultation, based on:

• Hardness of the cataract on slit-lamp examination
• Corneal endothelial cell count and health
• Pupil size and ability to dilate
• Zonular status (pseudoexfoliation, trauma, dislocation)
• Previous ocular surgery
• Patient cooperation and ability to lie flat

This is purely a clinical decision — never one based on cost. Both procedures are part of standard cataract care at SEI.

IOL Choice with MSICS

The same IOL options available for phaco are available for MSICS — including monofocal, toric, EDOF, and selected multifocal IOLs in suitable cases. See choosing the right IOL for details. Our refractive aim — 6/6 distance and N/6 near without glasses where possible — applies equally to MSICS patients.

Frequently Asked Questions