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If translations differ or are incomplete, the Traditional Chinese (zh-Hant) text on this site prevails.
Lens and refraction · N
Multifocal lens — who may not be suitable
Aberration · pupil · fundus
Last reviewed: 2026-10-06 · 潘家健醫生
Key points
Multifocal IOL screening looks at aberrations, pupil, fundus and lifestyle — no single absolute cut-off.
Irregular cornea, wet AMD, clear ERM/oedema or clear glaucomatous field loss usually argue against multifocals.
High night-driving demand also needs caution.
Final choice needs an in-person visit and consent — not a model pitch.
A readable summary of why a doctor may advise against a multifocal lens. No single measurement is an absolute cut-off. The choice still needs an in-person visit and consent. This is not a pitch for any model.
Situations that need extra caution or where multifocals are not suitable (qualitative)
Irregular astigmatism, corneal ectasia or scar, unstable tear film / severe dry eye
Macular or optic-nerve disease, significant field loss
Very small pupils or large night pupils; previous corneal refractive surgery
High night-driving need, high sensitivity to optical side-effects, unrealistic expectations
This is general medical information, not a diagnosis, and cannot replace an in-person consultation with a registered ophthalmologist, refraction, or a dilated fundus exam. It is not advice to use any medicine or undergo any procedure. Medicines (including off-label use), laser or surgery must be decided by a registered doctor after examination, according to indications and Hong Kong registration. Figures from the literature are published averages, not any clinic’s results. This site does not book, prescribe or refer. Do not change treatment on your own.
