IOL in loco?
Since the cataract OP of my left eye I have problems with the cooperation of my body and my vision. I don’t find things with my bodily action – my feet and my hands – where I expect them to be from my visual impression, which makes my consciousness dizzy.
I have now made the following experiment: Above the center of my laptop-display I have suspended a 15 cm large mirror below the center of which I have marked on the display a target for fixation. When I hold my head parallel to the display with the nose directed to the target and cover my left eye, I see with my right eye the central target almost on the same vertical line as my reflected nose in the center of the mirror. When, however, I cover my right eye, the mirror and the target seem to leap to the right side while I see my mirrored face displaced to the left border of the mirror. In binocular vision the spatial relation between the mirrored face and the target is intermediate, with a tendency to the impression of the - dominant - left eye.
This experience can be explained as follows: A lens is composed of prisms the refractive power of which is increasing on the borders. In the right eye, the image of the fixated near target hits the lens on the interior side near its center while the image of the nose falls on its exterior side so that both images are subject to very little prismatic effect. In the left eye, however, the image of the fixated near target and of the nose both hit the lens on its interior half so that the image of the near target hits the small lens on a place with a stronger prismatic effect than the image of the nose. It is therefore deflected wider to the exterior part of the retina where it is localized to far on the right side, thus deviating the binocular axis from the vestibular head-axis.
A similar deflection is suggested by an experience made with the pupillometer where I saw with the left eye and with both eyes, with spectacles and without, the central light on the right upper border of the presented hole.
Both phenomena point to a decentration of the IOL to the left side (and downward). Is one of the two haptics defective, allowing the other haptic (and the weight of the lens) to decenter the lens out- (and down-) ward?
An exotropia to explain the leap of the left near image to the right side can be excluded as I have perfect stereopsis.
My problem is not a what-problem but a where-problem. Can you help me?
Since the cataract OP of my left eye I have problems with the cooperation of my body and my vision. I don’t find things with my bodily action – my feet and my hands – where I expect them to be from my visual impression, which makes my consciousness dizzy.
I have now made the following experiment: Above the center of my laptop-display I have suspended a 15 cm large mirror below the center of which I have marked on the display a target for fixation. When I hold my head parallel to the display with the nose directed to the target and cover my left eye, I see with my right eye the central target almost on the same vertical line as my reflected nose in the center of the mirror. When, however, I cover my right eye, the mirror and the target seem to leap to the right side while I see my mirrored face displaced to the left border of the mirror. In binocular vision the spatial relation between the mirrored face and the target is intermediate, with a tendency to the impression of the - dominant - left eye.
This experience can be explained as follows: A lens is composed of prisms the refractive power of which is increasing on the borders. In the right eye, the image of the fixated near target hits the lens on the interior side near its center while the image of the nose falls on its exterior side so that both images are subject to very little prismatic effect. In the left eye, however, the image of the fixated near target and of the nose both hit the lens on its interior half so that the image of the near target hits the small lens on a place with a stronger prismatic effect than the image of the nose. It is therefore deflected wider to the exterior part of the retina where it is localized to far on the right side, thus deviating the binocular axis from the vestibular head-axis.
A similar deflection is suggested by an experience made with the pupillometer where I saw with the left eye and with both eyes, with spectacles and without, the central light on the right upper border of the presented hole.
Both phenomena point to a decentration of the IOL to the left side (and downward). Is one of the two haptics defective, allowing the other haptic (and the weight of the lens) to decenter the lens out- (and down-) ward?
An exotropia to explain the leap of the left near image to the right side can be excluded as I have perfect stereopsis.
My problem is not a what-problem but a where-problem. Can you help me?