- Monovision is a technique that sets each eye to a different focal point, one for distance and one for near vision, to reduce or eliminate the need for reading glasses.
- It is commonly used to address presbyopia, the age-related loss of near focus that typically develops after 40.
- Monovision can be achieved through contact lenses, LASIK, or intraocular lens (IOL) implants.
- The brain adapts to the arrangement through a process called neuroadaptation, which most people complete successfully.
- Trialling monovision with contact lenses first is a practical way to test suitability before committing to a surgical option.
Many people who pass the age of 40 develop presbyopia, an age-related condition that makes it increasingly difficult to focus on close objects. That is typically when reading glasses become necessary, which can be an inconvenience for many people, particularly those with active or demanding lifestyles.
Monovision is a technique that uses different lens prescriptions for each eye to provide clear vision at both near and far distances, potentially removing the need for glasses altogether.
How Monovision Works: Blending Distance and Reading Vision
Monovision works by setting each eye to a different focal point. One eye is optimised for distance vision while the other is set for near tasks such as reading. Each eye therefore focuses on different things depending on what you are looking at.
This may sound unusual, but in practice it tends to feel surprisingly natural. Most people have a dominant eye that they instinctively rely on more heavily. This eye is typically set for distance, while the other eye is corrected for near vision. Over time, the brain learns to favour the appropriate eye depending on the viewing distance, allowing both eyes to work together to deliver clear vision across a range of distances.
Although the arrangement involves a period of adjustment, many people adapt quickly and become entirely unaware of the different focal settings in each eye.
Monovision LASIK vs. Monovision Contact Lenses: The Differences
Monovision can be achieved in several ways, each with different implications for reversibility and long-term commitment:
- Monovision contact lenses set one lens for distance and the other for near vision. This option is fully reversible since lenses can simply be changed if the arrangement does not suit you. It is also an excellent way to trial monovision before considering surgery.
- Monovision LASIK permanently reshapes each cornea differently to achieve the same effect. Because this is a surgical procedure, it cannot be reversed, so it is important to confirm through a contact lens trial first that you can adapt comfortably to the monovision setup.
- Intraocular lens (IOL) implants replace the natural lenses of the eyes with synthetic ones set to different focal lengths. This option is often used alongside cataract treatment or as part of refractive lens exchange and can be reversed by replacing the lenses with a further procedure.
What Does it Feel Like? The Monovision Adaptation Period
When you first begin using monovision, whether through contact lenses or following surgery, the experience can feel unfamiliar. Each eye is receiving a different image simultaneously: one sharp for near objects and blurred for distance, the other the opposite.
Through a process known as neuroadaptation, the brain learns to select the image from whichever eye is providing the clearest view for a given task, effectively ignoring the slightly blurred input from the other eye. This process is successful in over two thirds of people and typically takes between one and two weeks, though for some it may take a month or more.
During the adaptation period, you may experience mild blurring, some eye strain, or reduced depth perception. These effects diminish gradually as the brain adjusts. Good lighting and practising by alternately focusing on near and distant objects can help speed up the process.
Pros and Cons: Is Monovision Right for Your Lifestyle?
As with any vision correction approach, there are advantages and drawbacks to consider:
Benefits of monovision include:
- Freedom from reading glasses, with clear vision available at a range of distances.
- Each eye has an uninterrupted view, unlike bifocal or multifocal lenses where the eye must look through distinct zones.
- Standard spherical lenses are used, making the approach more affordable than premium multifocal options.
- Most people adapt successfully and enjoy improved all-round vision.
Potential drawbacks include:
- Reduced depth perception, which may affect certain activities such as sport.
- Some patients experience reduced night vision, with glare or halos around lights.
- A proportion of people are unable to adapt to the monovision arrangement.
How to Test if You Are a Good Candidate for Monovision
You are likely to be a good candidate for monovision if:
- You have presbyopia at a relatively early stage, which makes adaptation easier as the near vision lens requires less power.
- You are motivated to reduce your dependence on reading glasses and willing to persevere through the adaptation period.
- Your lifestyle or work involves significant amounts of reading or close-up tasks.
- You have realistic expectations about what the adaptation process involves.
The best way to test your suitability is to trial monovision contact lenses for a period before committing to any surgical option. If you adapt well and are satisfied with the results, you can then consider a more permanent solution with confidence.
Our team at ScottHyver Visioncare can assess your vision and determine whether monovision or an alternative treatment is the right fit for you. Book a free consultation and we will walk you through your options with no obligation to proceed.
Frequently Asked Questions
What is monovision?
Monovision is a vision correction approach in which each eye is set to a different focal point. One eye is optimised for distance and the other for near tasks. The brain adapts over time to select the appropriate eye depending on what you are looking at, reducing or eliminating the need for reading glasses.
How long does it take to adapt to monovision?
Most people adapt to monovision within one to two weeks, though for some the process may take a month or more. Over two thirds of patients successfully complete the neuroadaptation process. Practising by alternating focus between near and distant objects and ensuring good lighting can help speed up adaptation.
Is monovision reversible?
This depends on the method used. Monovision achieved through contact lenses is fully reversible at any time. Monovision LASIK permanently reshapes the cornea and cannot be undone. IOL-based monovision can be reversed by replacing the implanted lenses. Your surgeon will explain the implications of each option during your consultation.
Can I drive with monovision?
Many patients drive comfortably with monovision once they have fully adapted. However, reduced depth perception and the possibility of reduced night vision mean that driving, particularly at night, should be approached cautiously during the adaptation period. Your surgeon will advise you based on your individual outcome.
