Marcus Welby, M.D. - Season 5 - Eps 5: The Light At the Threshold
Tracey Robbins has been plagued with diabetes for years and the disease has caused her to slowly lose her sight due to blood vessel malfunction. When her father fails to take her on a promised trip to Europe and her infatuation with Dr. Kiley undergoes a rude awakeing, the girl becomes withdrawn and refuses the operation.
About Marcus Welby, M.D.

Title: Marcus Welby, M.D.
First Air Date: 1969-09-23
Last Air Date: 1976-05-04
Status: Ended
Rating: 6.5/10 (from 19 votes)
Language: EN
Seasons: 8
Total Episodes: 171
Network: ABC
Genres: Drama
Production Companies: Unknown
Synopsis
Marcus Welby, M.D. is an American medical drama television program that aired on ABC from September 23, 1969, to July 29, 1976. It starred Robert Young as a family practitioner with a kind bedside manner and James Brolin as the younger doctor he often worked with, and was produced by David Victor and David J. O'Connell. The pilot, A Matter of Humanities, had aired as an ABC Movie of the Week on March 26, 1969.
Cast

Robert Young
Dr. Marcus Welby

James Brolin
Dr. Steven Kiley

Pamela Hensley
Janet Blake

Sharon Gless
Kathleen Faverty

Elena Verdugo
Consuelo Lopez