Presbyopia is a type of hyperopia, farsightedness, in which the lens loses its flexibility, making it difficult to focus on close objects. During the early and middle years of life, the crystalline lens of the eye has the ability to focus on nearby images by getting thicker and on distant objects by becoming thinner. Presbyopia occurs when this ability is lost.
Presbyopia is a normal part of aging that becomes more apparent as people approach their 40s and 50s. As the human body ages, the lens inside the eye grows like rings on a tree. It loses its elasticity, and therefore its ability to easily change focus, making it more difficult to read smaller print. Because LASIK and other forms of laser vision correction do not affect the lens of your eye, they cannot correct this problem.
LASER BLENDED VISION (LBV) LASIK
Blended Vision is an advanced method for treating patients with presbyopia. It offers the opportunity to achieve freedom from glasses by combining the simplicity and accuracy of corneal refractive surgery with the benefits of increased depth of field in retaining visual quality. As a surgical solution based on the naturally occurring spherical aberrations of the eye, blended vision extends the scope of customized ablation beyond the limits of conventional monovision laser methods in several ways.
How IS IT ACHIEVED?
Similar to conventional monovision, the dominant eye is corrected for distance vision, whereas the non-dominant eye is corrected to be slightly myopic for near vision. This micro-monovision strategy is further enhanced by a decisive difference: an increase in the depth of field of each eye using a wavefront-optimized ablation profile to create a continuous refractive power gradient for the whole optical zone of the cornea. Blended vision is an individualized treatment plan based on preoperative spherical aberrations and the functional age of the eye. As a result, a customized fusion of the two images for near and distance vision is created for each patient – the so-called “Blend Zone”.