If no goals are associated with a plaything, it is a toy. (Crawford notes that by his definition, (a) a toy can become a game element if the player makes up rules, and (b) The Sims and SimCity are toys, not games.) If it has goals, a plaything is a challenge.
Topic Overview. The post-void residual (PVR) urine test measures the amount of urine left in the bladder after urination. The test is used to help evaluate: Incontinence (accidental release of urine) in women and men. Urination problems. An enlarged prostate (benign prostatic hyperplasia, or BPH).
PVR is strictly defined as a complication of rhegmatogenous retinal detachment that is characterized by the formation of membranes on both surfaces of the detached retina and on the posterior surface of the detached vitreous gel.t is manifest by the formation of fibrocellular membranes on the retinal and posterior hyaloid surfaces. Most cells in PVR membranes originate from adjacent retina and the displaced cells synthesize much of the membrane matrix. The membranes have some features in common with healing wounds.