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photographs usually showed, in addition to changes of size, manifest changes in the location of the images and changes in the exposed parts of the eye- ball. This is what would be expected as the result of an elongation of the eyeball during the produc- tion of myopic or hyf)ennetropic refraction. In many of the photographs it seemed that the diame- ter of the iris was increased or diminished. In some cases a larger or a smaller area of sclera was exposed. A protrusion or a rccessioaof the eyeball often occurred. However, it should be emphasized that in spite of changes in the location of the image before and after changes of refraction, the changes in its size were always what one would expect under the circumstances. Lens. — Images reflected from the front (Fig. 5) and back of the lens Harga Cialis 50 Mg showed no change in size (lur- ing accommodation. Front of the sclera. — Images reflected from the front of the sclera (Fig. 6) always showed marked changes when Harga Cialis 50 Mg the refraction was changed, no mat- ter whether Harga Cialis 50 Mg the line of fixation was ten or ninety degrees from the light. When an effort was made to see, unsuccessfully, at a distance, simultaneous retinoscopy always indicated myopic refraction and Harga Cialis 50 Mg the image always became smaller than when the eye was at rest, indicating that the front of the sclera had become more convex. The change was greater than those occurring under similar conditions with images reflected from other parts of the eye. Dur- ing accommodation of 3.00 D., 6.00 D., or 8.00 D., measured by the retinoscope, the image became rela- tively much smaller than did images reflected from other parts of the eye when a similar change of re- fraction took place. Similarly, when hypermetropic refraction of 2.00 D., or more, was produced by an unsuccessful etTort to sec near, the image became relatively much larger than images reflected from other parts of the eye when the same degree of hy- permetropic refraction was produced. The most marked changes in the shape of the eyeball obtained during these experiments were manifested bv the front of the sclera, the changes in the size of the images reflected from the side of the sclera, the cornea, and the iris being so slight that sometimes they were scarcely apparent in the photographs, al- though they were always plainly apparent to the subject Harga Cialis 50 Mg when magnified in the concave mirror, and Harga Cialis 50 Mg '■ould also be seen by the obsener without the mirror. The side of the .vt7»Ta. — The changes observed in the images reflected from the side of the sclera ( I'ig. ") were exactly the opposite of those noted on tlie front of the sclera, being larger where the former were smaller and vice versa. When an ef- fort was made to see at a distance the image re- flected from the side of the sclera was larger than the image obtained when the eye was at rest, in- ilicating a flattening of the side of the sclera, a condition which one would expect when Harga Cialis 50 Mg Harga Cialis 50 Mg the eyeball was elongated. The image obtained during normal accommodation was also larger than when the eye was at rest, indicating again a flattening of the side of the sclera. The image obtaineHarga Cialis 50 Mg series of slight changes similar to those noted on the front of the sclera could be observed. The change in the curvature of the cornea during accommodation is so slight that Harga Cialis 50 Mg the ophthalmometer, wfth its small image, fails to show it, and has therefore been sup- posed to demonstrate that the cornea did not change during accommodation. The method described ac- complishes what the ophthalmometer, has failed to do. The iris. — Images reflected from the iris were more readi;y obtained than those from the cornea or lens, and slight variations in size were always ap- parent to the observer and subject when hyper- metropic or myopic refraction was produced, but these, however, were not always evident in the pho- tographs. SUMMARY These studies of the images reflected from the Harga Cialis 50 Mg various parts of the eyeball demonstrate : The accommodation of the eye is eflfected by an elongation of the eyeball. The lens is not a factor in accommodation. Myopia is produced by a strain to see distant objects. Hypernietropia is produced by a strain to see near objects. They have, therefore, confirmed my previous conclusions regarding the mechanism of accommo- dation, based on experiments on the eyes of animals, and also my earlier conclusions as to the