Marty Feldman, the actor in The Young Frankenstein suffered from exophthalmia, a condition related to Feldman's lifelong struggle with hyperthyroidism.
Retinitis pigmentosa is a heritable disease of the retina, affecting the photoreceptor cells on the retina. As RP progresses, the photoreceptor cells (rods and cones) die off and the affected person first loses peripheral vision then eventually becomes totally blind.
There is no obvious physical manifestation/ change in outward appearance of someone who has retinitis pigmentosa as the article described Wynn as having.
In severe cases of Hyperthyrodism somtimes diagnosed as Graves the reason for the bulging eyeballs is the fatty tissue diposits in such area.
Also common with Goiter and other thyroid endrocronogical diseases.
If treated in a timely matter with say Graves the fatty tissue will reabsorb but in chronic cases surgery may be required if the bulge is so pronounced that the eyelid cannot close over it.
Hence when I get tired my right eye protudes (due to severe graves now post) and my left eye reabsorbed the fatty so it appears normal. LOL I am half Marty when extremely tired.