The oval shape of the convex light barrier is designed to help a stoma that is difficult to manage: For example

Stretchable

Nu-Hope One-piece Post-Op Precut Deep Convex Adult Drainable Pouch with Closure Clamp 1-3/8" Opening Round

retains and transpires the exudates to provide optimal fluid management

Breathable side panels and soft inner liner provide comfort and promote healthier skin

9" Platinum Uro Pch, Microderm Plus, 1 3/8", 10/Bx Nebulizer Cups The oval shape of theCymed One piece Urostomy Pouch with Pre cut MicroSkin Barrier and 6mm Thick MicroDerm Plus Washer 1 3 8" Stoma Opening, 9" L, Clear, Odor proof Film, Comfort Backing, Latex freeCymed provides you with a variety of pouches for every type of ostomy. All are composed of Cryovak odor proof material and have a water proof comfort backing. Cymed pouches are Latex free and are available in either clear or opaque. This is a clear, adhesive pouching system