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Visual Acuity Test Snellen Chart
Read smallest line: The snellen chart is a graded series of letters or numbers smaller as you go down. The uncorrected vision is the smallest line easily read with each eye. Your ophthalmologist will present you with lenses to improve the level of the smallest line to hopefully get you to 20/20 - the standard of normal. It is a subjective test requiring your active input. ...Read more
No, not always: Visual acuity is a measure of how well you see. In most cases this reflects on what your prescription might be but it can't estimate it exactly. There are many other factors that determine how well you see: if your retina is healthy and if there are other problems with your cornea or lens. It's possible to have poor visual acuity and yet have no need for glasses. ...Read more
Ratio: The ratio is an indirect way of measuring how small of an object can be resolved independent of the distance at which it is viewed. For snellen fractions (20/20 for example), the top number is represents the testing distance and the bottom number is an indirect measurement of the size of the object. ...Read more
Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?
Usually it is fine: You have defects in the central visual portion of your field of view - an area poorly outlined by most field testing devices. Field tests will define major defects which largely will register from the peripheral areas tested. Have you had a field tested in the past? Is there some condition being sought for with a field.? Your ophthalmologist would not order a field if he doubts the result. ...Read more
Raptors: The sharpest vision that we know of occurs in the raptor group of birds (eagles, hawks, falcons) who have four times better acuity than humans. Visual charts in ophthalmologist offices start at 20/10 and a few can reach this point. I am sure there are some with 20/8 or so but the limit is the tight packing of the photoreceptors in the same size space. ...Read more
Lt.eye mac.pucker.Corrected vision 20/40 µpsia.Amsler grid nl.Corrected vision 20/40.Age 69.Could the macuar pucker cause micropsia?Rt. eye20/30.
Micropsia: Yes, it can if the macular pucker is severe enough. Micropsia is a condition in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema,macular degeneration, and more ...Read more
Glaucoma rt. eye.Humphrey field test full within normal limits.DMV peripheral vision test 50 deg left & 70 deg right. Dr says DMV test wrong.Possible?
Depends: Most Humphrey testing is 30-50 degrees from the center simply because ones that measure farther out take too long a time and most glaucoma changes start in the center. The DMV tests check a couple of horizontal points about 60 degrees and 130 degrees out. So it depends upon which testing you went through. Hopefully, with a glaucoma diagnosis, you are seeing a real doctor - an ophthalmologist. ...Read more
Normal field vision test. Dilated optic discs small w/slight asymmetry. Suspicious oct scan. Eye pressure 27. Family history. Suspect for glaucoma?
Usually not: If the vision in one eye is normal, the lowered vision in the fellow eye will not impede academic achievement. There is little in academics that requires excellent vision in both eyes. The only areas affected would be those requiring stereoscopic vision. I have know doctors, lawyers, engineers and professors who have a lazy (amblyopic) eye. ...Read more
Eye test report spherical +.75 cylindrical -.5 axis 180 axis. Symptoms headache work on computer daily basis for 4 hours?
Visual field test result normal - 3/14 fixation error. Some peripheral vision loss not in field of vision. Why does test result say normal?
Nerve fiber pattern: Bitemporal hemianopia is the classic later stage vision pattern in advancing pituitary tumor. Generally the central fibers, which carry the best acuity are affected later in the condition. A great deal of vision loss would have to be ignored by someone with this condition before the nerve fibers for the central acuity start to drop out. ...Read more
Visual acuity. CC: OD 20/25-2 ... OS 20/30-2 ... intraocular pressure OD 21 OS 18 ...any interpretation or explanation for theses eye vision results?
Eye Exam: CC means with correct, like glasses or contact lenses. OD, right eye. OS, left eye. 20/25-2 means that you missed 2 letters on the 20/25 line on the vision chart. Intraocular pressure is the pressure inside your eyeball that keeps it from collapsing, similar to air pressure in your car tires. It is reported in mm Hg. Statistical normal is between 8 and 23. ...Read more
Photophobia, ghosting, glares, starbursts.No cataract, power fine, no astigmatism n cornea ok(topography).Wavefront error of 0.66.What should I do to cure?
Use monovision w/some blurring at distance & computer. Could single vision contact for distance eye & bifocal contact for near eye improve vision?
Monovision: is very effective of roost people. Variations for the optimum distance (far, intermediate and near) can be obtained through single vision contact lenses or a combination of single vision lens and multifocal lens. Your eye care provider will be able to determine the power and variations from your examination. Be sure to verbalize your needs and illustrate to him/her the distances involved. ...Read more
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