Retina display screen damage and partly visibale as it fell down

as fell down and partly not visibale,A1502 model is to be replaced with unibody and costs very high,

revert me can i go for glass change ,

1 glass is avilabale in open market

2 can i have the retina repaired with glass replacement

3. technical knowhow to replace by outside experts then apple service centers

regards

Dr srinivas