Presbyopia » Monovision » Disadvantages of monovision

Ways of presbyopia correction using monovision has certain advantages, but of course also has many disadvantages and limitations. It could cause in certain activities serious problem, therefore monovision is not suitable for everyone and for all activities.

Loss of stereopsis. Monovision decrease fine the stereoacuity. Patients are most aware of this loss depth perception immediately after beginning monovision contact lens wear. This discomfort generally subsides as the patient is ability to preferentially suppress the image from one eye improves. Nevertheless, it is best to avoid monovision correction in individuals whose daily tasks require excellent stereoscopic vision.

Reduction in distance acuity. Most individuals see better when using both eyes than when using just one eye. Thus, when we intentionally decrease the distance acuity in one eye, patients frequently report that their vision does not seem as clear as it was with full distance correction in both eyes. Again, most patients adjust to this within a few weeks of monovision should be avoided in individuals who require excellent distance acuity in both eyes, such as professional drivers and aviators.

Difficulty with night driving. In low ambient illumination, the pupils dilate. This increases spherical aberration. Lack of visual contrast can increase image confusion, especially when one eye is not corrected accurately distance. As discussed above, patients may benefit from a pair of eyeglasses that brings the undercorrected eye to 20/20 distance acuity, or by having a third contact lens (or lenses) with full distance correction for the habitual near eye.

Reduction of contrast sensitivity. The decrease in contrast sensitivity in similar to that encountered in bifocal contact lens users with bilateral simultaneous vision.