Perfect Sight Without Glasses presents William Horatio Bates's argument that many visual defects arise from strain and may be relieved through relaxation, shifting, central fixation, and other exercises rather than spectacles. Written in confident reformist medical prose, it blends clinical anecdote, physiological speculation, and practical instruction. Within early twentieth-century ophthalmology, as refraction science professionalized, Bates's work became a dissenting text: popular among lay health reformers, yet sharply contested by mainstream eye medicine. Bates (1860-1931), an American physician and ophthalmologist, trained within orthodox medicine before advancing his theory that ocular and mental strain, not merely optical error, lay behind impaired sight. His clinical experience, dissatisfaction with lifelong dependence on corrective lenses, and interest in relaxation shaped the program later called the Bates Method. The book reflects professional ambition and a Progressive-era faith in self-cultivation, natural healing, and disciplined attention. Readers should approach Perfect Sight Without Glasses as a historically important document rather than a substitute for contemporary ophthalmic care. It will reward historians, students of alternative medicine, and general readers interested in the contested borders of science and popular therapeutics. Its enduring value lies less in settled science than in revealing a persuasive vision of bodily self-command.