Spectacle secrets

Chapter 19: Transcriber’s Notes

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About This Book

A practical manual explains the history and invention of spectacles and basic optical principles, describes the physiology of the eye and common visual defects, and gives clear guidance on selecting and testing lenses, including how to determine focal lengths. It exposes deceptions practiced by itinerant and dishonest opticians and warns against gimmicks and false claims, offering rules for avoiding fraud. The author condenses technical knowledge into plain language, supplements advice with examples and correspondences with medical practitioners, and emphasizes empirical, scientifically based remedies to help readers make informed purchases and protect themselves from quackery.

Transcriber’s Notes

pg 43 Changed: and the eminent individval himself
to: and the eminent individual himself
pg 45 Changed: ground in a pecular manner
to: ground in a peculiar manner
pg 45 Changed: the only real original manufacter of them
to: the only real original manufacturer of them
pg 49 Changed: received from the first familes
to: received from the first families
pg 60 Changed: charge according to the gullibilty of his dupes
to: charge according to the gullibility of his dupes
pg 61 Changed: being to expose a system of villany
to: being to expose a system of villainy
pg 62 Changed: The Royal Opthalmic Hospital, in Moorfields
to: The Royal Ophthalmic Hospital, in Moorfields
New original cover art included with this eBook is granted to the public domain.