Contact lenses or spectacles: choosing honestly

This comes up at almost every fitting, usually framed as though one option is the upgrade. It is not. They are different tools with different trade-offs, and the majority of contact lens wearers should own an up-to-date pair of spectacles as well.

Where spectacles are better

Nothing touches the eye. No risk of microbial keratitis, no corneal oxygen concerns, no handling hygiene to maintain. For an eye with a compromised surface — significant dry eye, blepharitis, allergy — this is decisive.

They protect. Not impact protection unless specified, but a physical barrier against dust and wind, which counts in harmattan and on a construction site.

Cheaper over time. A one-off purchase against a recurring one.

Simpler. No case, no solution, no schedule, nothing to run out of.

Better for some prescriptions. High astigmatism, certain complex corrections, and anyone needing prism.

No infection risk when you are unwell. Lenses come out when you have a cold or an eye infection; spectacles do not care.

Where contact lenses are better

Full peripheral vision. No frame edge, no gap at the side, no distortion at the lens periphery. For strong prescriptions this is a substantial difference, not a marginal one.

No fogging, no rain, no slipping. Relevant in this climate, particularly stepping from air conditioning into humidity, and for anyone wearing a mask.

Sport. Almost always the better choice, with protective goggles over them where needed.

Less image size distortion in strong prescriptions. A high minus lens shrinks the image and a high plus lens magnifies it; a contact lens sitting on the eye does this far less.

Large differences between the two eyes. Where spectacle lenses would produce images of noticeably different sizes that the brain struggles to fuse, contact lenses often solve the problem outright.

Appearance and confidence, which is a legitimate reason and does not need justifying in clinical terms.

The medical uses

Contact lenses are not only a cosmetic alternative. Rigid gas-permeable and scleral lenses are the primary treatment for keratoconus and for corneas irregular after injury, infection or surgery, where spectacles cannot produce usable vision at all. Specialised soft lenses are used in myopia control in children. Bandage lenses are used therapeutically to protect a healing corneal surface.

The honest downsides of lenses

They carry a real, if small, risk of sight-threatening infection, and that risk is concentrated almost entirely in poor habits: sleeping in lenses, water contact, overwearing past the replacement schedule, and a neglected case. Handled properly they are safe; handled casually they are not.

They also require a fitting and aftercare. The curvature and diameter of your cornea determine which lens fits, and a poorly fitting lens abrades the surface or starves it of oxygen. Lenses bought without a fitting — including coloured cosmetic lenses from market stalls, which are the same medical device with pigment added — are a recurring cause of corneal damage here.

Choosing a replacement schedule

Daily disposables are the safest option: a fresh sterile lens each morning, no case, no solution, nothing to contaminate. They cost more per month and are the right choice for occasional wear, for sport, and for anyone with allergy or a history of complications.

Monthly or two-weekly lenses are more economical for daily wear but depend entirely on the cleaning routine being maintained.

The answer most people arrive at

Both. Contact lenses for work, sport, and occasions where they suit; spectacles for evenings, for when the eyes are tired or unwell, and for the days when the surface needs a rest. Wearing lenses every waking hour without a break is where problems accumulate, and having a current pair of spectacles is what makes taking a break possible.

Whichever you choose, keep the aftercare appointments. They exist to find the changes you cannot feel.