How does refractive surgery work ?
Corneal inlays,laser resurfacing, lens replacements are some of the refractive surgery options.
Presbyopia treatment usually involves glasses or contact lenses.Some people opt for refractive surgery options.
It is best to determine pre-refractive surgery if simulations (by experiencing contact lenses or glasses designed for monovision )of various visual trade offs can be tolerated eg monovison where one eye functions more for near and the other far,or putting such zones in multifocal contact lenses.Trial fogging of one eye or the other binocularly can be employed until blur and monocular compromise can be “seen”.
Corneal inlays are sometimes surgically placed within the cornea or procedures undergone to change its shape and hence its focusing power.
In cataract removal and lens replacement surgery and clear refractive lens exchange can engineer focusing outcomes but even variations in pupil size can influence the results such as haloes,glare,tear disturbances or imbalances between the eyes.The natural lens focuses by accommodation (its shape actually changes and much R+D is trying to duplicate this)
Multifocal lenses give clear vision at multiple distances and can be succesfully employed in glasses and contact lenses.
Extended-depth-of-focus lenses can work for different range requirements but often require glasses to optimise and balance the eyes vision in the required ranges