on Muscular Motion. 
3 
sustain : under these last circumstances near objects cannot be 
seen at all without considerable pain, and never distinctly, the 
eye not remaining a sufficient time adjusted for that purpose. 
I cannot better explain the nature of this disease, than by 
giving an account of the symptoms which occurred in the fol- 
lowing case. 
A gentleman forty years of age, naturally short-sighted, of 
a delicate irritable habit from his infancy, never able to bear 
much bodily fatigue, being always soon tired by walking, or 
other exercises that required muscular exertion, had the fol- 
lowing affection of his eyes. 
His sight had been very perfect till he was nineteen years of 
age; at that time he resided in a part of the country where the 
ground consisted principally of white chalk, which produced 
an unpleasant glare ; and his constant amusement both by 
day-light and candle-light was drawing, which he frequently 
pursued so far as to fatigue his eyes. While thus employed 
his complaints had their origin. The first symptoms were that 
of being unable to look long at any object without pain, and 
feeling uneasiness when exposed to strong light. The eyes to 
all appearance were free from disease, having no unusual red- 
ness, nor any purulent, or watery discharge. The plan that 
was first adopted for his relief consisted in lowering the sys- 
tem, both constitutionally and locally; but this treatment ren- 
dered him more irritable, and made his eyes rather worse than 
before ; he therefore, after a trial of eight years, in different 
means of this kind, gave them entirely up. For the next five 
years, in which nothing was done to the eyes, the symptoms 
appeared to have been stationary; but at the end of that period, 
his mind suffering from an uncommon degree of anxiety, the 
Be 
