Figure 4. Grading of mid-haptic compression.

Different grades of mid-haptic compression on conjunctival tissue and blood vessels. The intensity of the “whitish band” at the mid haptic area in comparison to the adjacent tissue colour along with the potential occlusion of the capillaries (minor vessels) as well as major vessels of the bulbar conjunctiva marks the intensity of mid-haptic compression. Panel A indicates an optimum scenario where neither the major vessels nor the capillaries are compressed by the mid haptic region of the lens. In addition, the tissue colour of the underlying bulbar conjunctiva remains indistinguishable. Panel B depicts the lens fitting where we start observing the difference in the tissue colour around the mid haptic area due to the compression at that area. However, this is considered as “acceptable” as the major conjunctival vessels remain unaffected. Panels C and D demonstrates an increasing difference in tissue colour and an appearance of a prominent “white band” at the mid haptic area of the lens. An additional impact on major vessels makes the lens fit “not acceptable” and needs immediate attention for modification.