Shapes o Lenses I n t h e majority of cases regular shape lenses should be u se d but the short oval is very advantageous ma n y time s . Where the patient does a great amount of near work the short oval offers a large field of vision u p and down the direction in which i t most needed. This s hape is also desirable in ca s e s of narrow P D. for here i t i s usually neces s a r y to u s e small lenses which naturall y restrict the field of vi s ion. The s i s de s igned for people having y protruding brow s ; i t resembles the short oval with t h e top rounded off. Odd shapes of lenses - that is any but the regular and short oval - should be generally avoided for their appearance is far from pleasing and gives a s uggestion of grotesqueness to the face. Oval Short Oval Leaf Shape Crescent 9 P.D. stands for pupillary distance.
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