Hints to students on the use of the eyes / by Edward Reynolds.
- Edward Reynolds
- Date:
- 1835
Licence: Public Domain Mark
Credit: Hints to students on the use of the eyes / by Edward Reynolds. Source: Wellcome Collection.
Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)
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![conditions of the system, there are certain signs resulting from undue use, common to all. A little attention to these will enable each one to ascertain, when he is liable to pass over the bounds of safety, and when it has be- i come necessary that he should begin to relax his eiforts,J and think of a wise economy of the eyes. They are the following: 1. The focus of vision, (punctum distinctae visionigAl is brought nearer to the eye than usual—in other words, it I is shorter—so that small objects must be brought closer to the eye than the individual has been accustomed to, in order to obtain distinct vision. 2. There is a sensation of painful distension of the I whole region about the eye, especially after continued ,i labour which has been attended with any straining of the j sight. This, however, soon disappears, after a short re-J pose from study. Let the student close the eyes, andi rest them for a quarter of an hour, and he will feel it no,.] more. 3. When the labour has been of long duration, and! accompanied, not only with considerable straining of the>l vision, but also of the mental powers, in addition to the above mentioned sense of distension, the student perceives an unusual feeling of increased heat ; there is a peculiar! warmth of the eye-lids, with a difficulty in raising themj and also of moving the eye-balls with their usual facility. 4. If while labouring with the eyes, he attempts tori look accurately at some distant object, they involuntarily i fill with tears, or at least are more moist than common. 5. A moderate but uncomfortable headach, more paMi ticularly about the region of the eye-brows, accompanied ,i by an unpleasant sense of weight, will be felt during oul immediately after labour. 6. If the subject is young and plethoric, in addition tod the above symptoms, the edges of the lids become red. and somewhat thickened ; and the conjunctiva, the mem- i brane covering the white of the eye, appears more turgid ) and vascular than in its usual, healthy condition. 7. Finally, a thin cloud suddenly comes, for a few mo- ments, before the eyes; objects for a short space appeal 36](https://iiif.wellcomecollection.org/image/b21633903_0042.jp2/full/800%2C/0/default.jpg)
