From the age of 40, reading a notice, a restaurant menu... becomes complicated! The accommodative power (or "autofocus" system) of the eye loses its effectiveness and near vision becomes difficult. After the age of 55, the accommodative power of the eye decreases, which increasingly bothers people with presbyopia.
A difficult evolution of presbyopia
However, it has been observed that other elements can also be penalizing:
- Miosis (pupil contraction) linked to presbyopia
- A decrease in the transparency of the ocular media: cornea, lens, vitreous body, requiring stronger illumination which is not always well tolerated.
- A decrease in visual acuity linked to various pathologies requiring an increasingly closer working distance.
- A convergence insufficiency that must be detected and, if possible, lead to orthoptic rehabilitation.
In some emmetropic or emmetropized presbyopes (i.e., perfectly corrected for distance vision), the nearest point to the eye seen clearly (punctum proximum) recedes. It even reaches 2 m around 65-70 years old with a correction of 3.00 D. One would have to position their text 2 m away to be able to read it!
It is then clear that all near vision and proximity vision activities become difficult. Working on a computer screen, following exhibition captions in a museum, reading prices in shop windows... all become complicated.
Only degressive or progressive lenses allow perfect focusing at these distances. Visual needs for proximity vision are increasingly important with the daily use of tablets, computers, videos, smartphones...
It is therefore essential to accurately determine and know the proximal distances used by each person to better meet their needs. Before choosing your glasses, it is therefore essential to carefully assess your needs and seek advice from a professional.
The solution: proximity lenses
Progressive lenses are the most commonly used means to correct presbyopes. They are indeed the most effective lenses for correcting all types of vision.
However, many daily tasks solicit our intermediate vision (office work, computer, cooking, music...); proximity lenses are the ideal solution: they offer better visual and postural comfort, especially for people suffering from neck pain and/or needing a very wide intermediate field of vision.
Proximity lenses (or degressive lenses) have been designed to optimize the wearer's comfort in their environment with large fields of clear near and mid-distance vision while maintaining a natural posture.
The field of vision is the extent of space in which an object can be perceived when the head and eye are immobile. The depth of field is the range of distances within which an object is seen clearly.
