Eyesight
Eyesight, also known as vision, visual sense, or simply sight, was the ability to see with one's eyes. The loss of eyesight was referred to as blindness. One of the symptoms of transporter psychosis was diminished eyesight, which eventually lead to acute myopia. ()

According to Weyoun 5, Vorta "have poor eyesight. It's something we've learned to live with." He continued by explaining  that the "Jem'Hadar, on the other hand, excellent vision. I suppose they need it more than we do." ()

Check a patient's eyesight was often a part of a physical. (; )

After Spock regained his eyesight, Captain James T. Kirk thought that such an experience for most would be an emotional experience, but he presumed Spock felt nothing. Spock, to the contrary, had "a very strong reaction" to regaining his sight, as the first thing he saw was "the face of Doctor McCoy bending over me." Leading McCoy to retort: "'Tis a pity your brief blindness did not increase your appreciation for beauty, Mister Spock." ()

When Henoch possessed the body of Spock, he noted that he seemed to have received the best of the three bodies possessed. Noting how "strength, , eyesight, all far above your Human norms." ()

When Geordi La Forge suffered from polywater intoxication in 2364, it was reported that he was overheard "longing for normal eyesight." ()

In his poem "Ode to Spot", Data noted that Spot's visual sense, along with his auditory sense and his olfactory sense, contributed to his hunting skills and natural defenses. ()

Julian Bashir was born with poor eyesight, along with a developmental delay and several other physical issues. At age six, his parents had him genetically-engineered to fix these issues and his eyesight ended up better than that of the average human. ()

When Chakotay and Neelix fell victim to alien experiments, they both complained about their conditions, where Chakotay complained about losing his eyesight, explaining that a nearby display was nothing but a blur, Neelix noted that his s had dilated 60 percent and he couldn't even look at the display, because it was so bright. ()

See also 
 Audio-visual suggestion
 Color blindness
 Double vision
 Night vision
 Short-sightedness

External link 
 
Physiology