IOL strategy explained

Monovision: options to discuss

Monovision uses a different focusing target in each eye. The lens category and the size of that difference are separate decisions. Examples to discuss include:

  • Standard monofocal IOLs for full monovision
  • Enhanced monofocal IOLs for mini-monovision
  • Extended Depth of Focus (EDOF) IOLs for micro-monovision

A monovision strategy can be considered when the goal is less dependence on glasses at several distances. Standard monofocal lenses can also be used for mini-monovision; the category does not dictate the difference between the eyes. Ask your surgeon to compare the proposed models and targets together.

This page explains one IOL strategy. Complete the questionnaire to see which discussion your answers point to; the questionnaire does not assess medical suitability. Complete the questionnaire

Detailed explanation of this option

Monovision may reduce glasses use, but it does not guarantee unaided distance and near vision. The planned difference in refractive power between the eyes is called anisometropia. Some people tolerate it well and others do not, so discuss a contact-lens simulation when it is meaningful and understand that it cannot reproduce an implanted IOL perfectly.

Monovision means setting one eye for distance and the other for near vision.

  • Full monovision usually uses a larger difference between the eyes and may provide more near range, with a greater chance of reduced stereopsis or discomfort.
  • Mini-monovision uses a smaller difference, usually preserving more binocular balance but providing less near range.
  • Micro-monovision uses a still smaller offset, often with a range-extending lens. The labels and dioptric cut-offs vary between studies and clinics, so ask for the actual target in each eye.

The plan relies on using the two differently targeted eyes together. The binocular result depends on the size of the offset, the lens, residual refraction and the visual task. Some people notice reduced depth perception or uncomfortable imbalance, which is why simulation and a precise discussion of the target in each eye matter.

Important before choosing standard monofocal monovision

Standard monofocal monovision remains a valid option, particularly when cost, medical suitability, contrast needs or local availability matter. But it should not be the automatic default. Enhanced monofocal and selected EDOF lenses can sometimes provide a broader usable range with a smaller difference between the eyes. A smaller difference may help preserve depth perception, but can provide less near vision. The lens design has its own benefits and limitations: ask about the proposed model and targets together.

Ask your surgeon directly: “Could an enhanced monofocal or EDOF mini-/micro-monovision plan achieve my goal with less anisometropia?” If the alternatives and their trade-offs are still unclear, discuss the plan with me or seek another surgical opinion before the target for the second eye is fixed.

Enhanced monofocal IOLs · EDOF IOLs

Evidence note: Recent research suggests enhanced monofocal and EDOF mini-monovision may extend intermediate vision or reduce the offset required between eyes, but superiority over standard monofocal strategies is not guaranteed and depends on the lens, target and patient. 2025 systematic review · binocular-function study

Final visual quality also depends on residual refraction, astigmatism, ocular surface, retina, optic nerve and the exact lens model—see Compare IOLs for a side-by-side view.

Understand the choice before deciding: see how distance, intermediate, near and monovision targets change what you may need glasses for.

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