Eyesight, and how to care for it / edited by George Black.

Date:: [1888]

Catalogue details

Licence: Public Domain Mark

Credit: Eyesight, and how to care for it / edited by George Black. Source: Wellcome Collection.

99/168 (page 95)

to set to work at the bank as soon as we return from the wedding tour.' Asthenopia sometimes exists without optical defect, in cases of disturbance of the general health, particu- larly of a nervous character. The external muscles of the eyeball or the muscle of accommodation act insufficiently, painfully, or irregularly; or the sensi- bility of the retina is easily exhausted, and any object looked at fixedly seems soon to fade away. In some cases, though the eyes do their part perfectly well, the mere mental effort involved in reading brings on a headache or dizziness that makes it impossible to continue. This form of the affection, however, is exceptional, and should never be admitted until a careful examination of the eyes has excluded every possible physical cause. The strain caused by optical defects is sometimes manifested only by an irritability of the eyes, or a slight chronic inflammation of the conjunctiva or lids.