01 · ACCOMMODATION
Near vision requires accommodation
A younger eye increases the optical power of the crystalline lens to focus at near.
During prolonged near work, that accommodative state is maintained for long periods.
Near accommodation is an optical demand related to viewing distance and refractive status, not simply a vague measure of 'using the eyes too much.' Two people using the same phone can face different demands depending on their correction and actual viewing distance. This is why accommodative load is only one possible component of near-work discomfort.
02 · SMALL ADD
A small amount of plus power can be added below
Depending on the product, the lower area contains a small increase in plus power.
When reading or using a phone through this area, the optical demand for accommodation can be reduced by part of the added power.
The lower support or boost area provides slightly more plus power than the distance portion, which can reduce part of the accommodative demand at near. The boost amount and the way power changes through the lens vary by product, and several support levels may exist within one product family. The term anti-fatigue alone therefore does not tell you the actual support power.
03 · NOT A PRESBYOPIC PROGRESSIVE
The goal differs from a presbyopic progressive lens
Progressive lenses for presbyopia often use a larger addition to compensate for reduced accommodation.
Anti-fatigue products are often proposed before a full presbyopic progressive is needed, but suitability depends on accommodation, binocular vision, prescription and working distance rather than age alone.
The boundary between an anti-fatigue lens and a presbyopic progressive is not defined by a universal product name. Anti-fatigue designs have traditionally used a relatively small lower boost while retaining a large distance area, but available support powers now span a broader range. Selection should be based on accommodative ability, age and near demand rather than a rigid 'young equals anti-fatigue, older equals progressive' rule.
04 · SYMPTOMS
Eye fatigue has more than one cause
Dryness, long screen use, inaccurate prescription, binocular-vision issues, posture and the work environment can all contribute to discomfort.
Reducing accommodative demand is not the same as guaranteeing a reduction in symptoms.
Eyestrain can come from uncorrected hyperopia or astigmatism, an inaccurate prescription, ocular surface dryness, binocular or accommodative problems, long screen sessions and poor workstation conditions. A boost zone may reduce a component of accommodative demand, but it does not treat all of those causes. Persistent symptoms, diplopia, pain or a decline in vision require appropriate clinical evaluation rather than simply adding more support power.
05 · PRESCRIPTION
Some people may benefit and others may not
Accurate refraction and near-vision assessment should come first.
An unnecessary addition can make distance or intermediate vision feel strange.
The wearer must actually look through the support zone for the design to work as intended. If the frame slides down or the fitting height is wrong, the near gaze may pass through the wrong part of the lens. Monocular PD, fitting height and a stable frame position therefore matter even when the boost is modest.
SOLUTION GUIDE
When evaluating an anti-fatigue lens
It may be worth comparing.
Check prescription, binocular status and work conditions first.
Do not assume the issue is simple fatigue.
GLANOS LENS CHECK
Check the prescription before the symptom label
Confirm the distance prescription and near status before deciding whether an added support zone is appropriate.
CAUTION
“Anti-fatigue” is a product category, not a medical treatment claim
Persistent discomfort may have other optical, binocular, ocular-surface or environmental causes.
GLANOS EYEWEAR
There is a reason glasses feel uncomfortable.
anti-fatigue lenses · accommodative support · near vision · accommodation · computer glasses · spectacle lenses