If the receptors were at the front of the retina, the pigment cells would have to be between them and the next layer of nerve cells, in a region already packed with axons, dendrites, and synapses. As it is, the layers in front of the receptors are fairly transparent and probably do not blur the image much.
The definition of impervious is not being able to be penetrated or not able to be hurt. 1  An example of impervious is a fabric that does not allow any liquid to pass through. 2  An example of impervious is a figurine made out of indestructible material.
Definition of 'defer'. Word Frequency. defer (dÉªfÉËÊ³ ) Word forms: 3rd person singular present tense defers , present participle deferring , past tense , past participle deferred. 1. verb. If you defer an event or action, you arrange for it to happen at a later date, rather than immediately or at the previously planned time.