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    Trotters Ophthalmic Opticians, Edinburgh – Eye Care Glossary

    Is  the name given to acharacteristic of a lens which prevents the formation of a perfect image. Aberrations affecting the quality of images produce degraded sharpness, lowered contrast, distorted shape, and colour fringing. Ablation Technique usually used to correct near-sightedness.  It is achieved with excimer laser in which tissue is removed from the central optical zone with the intent of reshaping the cornea’s curvature. Accommodation The ability of the eye to change its focus from distant object to near.  The eye achieves this by altering the shape of the crystalline lens with the ciliary muscles. Acuity Is a measure of how clearly the eye sees. Clearness, as in visual acuity.…