Doctor insights on:
Waves In The Field Of Vision Peripheral
Hemi-field loss: Is usually due to a pathology posterior (behind) to the eye itself. A lesion or area of pathology will usually be located from the area of the pituitary gland (approx. just forward of central brain) where the optic nerves cross to anywhere along the optic radiation ending at the occipital lobe (portion of the brain at the lower back of the skull). An MRI or CT can usually identify the cause. ...Read more
Could cone cells migrate from fovea toward peripheral areas of the retina and vice versa in human eyes?
No: The light receptive rods and cones are locked in place during development. They cannot migrate once development has occurred. ...Read more
Does peripheral vision refer only to the sides/corners of the visual field on horizontal axis or also the top/bottom part of vision on vertical axis?
Both: Yes, in includes all quadrants.Get a more detailed answer ›
Random white flashy circles in peripheral both sides. Full vision good in peripheral and front. Ocular migraine or beginning of retina tear? Worried
Migraine: You are having symptoms in both eyes. Retinal detachment can start with such symptoms but is extraordinarily rare in both eyes except after severe eye trauma. Your symptoms are much more likely that of ocular (or occipital ) migraine. If you are worried to the point of distraction or sleep loss, then check with your ophthalmologist. ...Read more
No: Cone cells are fixed in position and cannot move. ...Read more
YAG iridotomy at 12 o'clock position. Have ghost images in lower field of vision. Looks kind of like a line/crescent of light Will these resolve?
Most often yes: Sometimes no, if it does not, please look into a corneal tattoo (rarely needed but works very well to block the extra light coming through or colored contact lens. ...Read more
Yes: Visual field testing will occasionally pickup small areas of visual field depressions if the floater is particularly large and thick, as some patients may have. Since they move, a repeat visual field should also show the depression to have moved. I would not however expect a large visual field abnormality from a floater and certainly l recommend an exam to rule out any problems by an eye md. ...Read moreSee 1 more doctor answer
Floaters big shadow in vision with vision acuity 6/6 both 12/12 eye pressure and pulsating in vision all drs saying there's nothing in retina??
Amount of light: Pupil size controls the amount of light entering the eye and does not affect the image per se. The image is formed due to the curvature of the cornea and the refractive indices of cornea and the lens. The lens does adjust its focal length to sharpen the image. ...Read moreSee 1 more doctor answer
Flashes at the bottom of eye means vitreoretinal traction at the top?Similarly traction at nasal side of the vitreous base causes flashes in temporal?
Usually: The retina receives an image upside down and reversed (it is perceived by the brain as right side up) and so traction as you describe occurs in the opposite part of the back of the eye to its projected image. So traction at the top causes symptoms in the bottom of the field of view for instance and traction towards the nose is perceived as light coming from the temporal (ear) side of the view. ...Read moreSee 1 more doctor answer
Are sparkles in vision a sign of brain tumor? Why? Because of optic nerve or chiasm pressure?Or occipital/parietal lobe pressure? Please elaborate
Control mechanisms: A lot of recent research has concentrated on finding ways to better control artificial arms. Some researchers are working to use the nerves left in the arm to control the prosthesis (targeted muscle reinnervation- tmr) others on using the brain signals to control the prosthesis. Sounds sci-fi but it is not these days! tmr trained physicians are doing surgeries at various centers in the us. ...Read moreSee 1 more doctor answer
Rare: Most migraines with an effect on the visual system usually cause the same phenomenon visually in each eye (cover one then the other to detect this). A very rare spasm of vessels in one eye only causes unilateral migraine but this is rare. Test your migraine if you have another and you can find the source which is probably the occipital lobe in the brain. ...Read more
Blood inside the eye: Bleeding can occur from trauma, vascular events and certain hereditary illnesses that affect the eyes. Free blood in the eye drops the vision and bleeding can also occur in the substance of the retina with variable effect on the vision (e.g. In diabetes). Any bleeding in the eye needs immediate evaluation by your ophthalmolgist. ...Read moreSee 1 more doctor answer
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