. A treatise on diseases of the eye . Purkinje used a perinieter witlifield. ra<lius of 10 cm. He nearsighted and measured his own FIELD OF VISION 141 half of the retina, or that the fovea eentraHs is placed coiisidt-rahly tothe temporal side of the posterior pole of the eye. i\Iaii(liiier attemptsto prove that a difference of 5 degrees maybe accounted for in this Spot.—The physiological blind spot (Mariottes blind spot)in the field of vision, described by Mariotte in 1668, corresponds to the Fig. 104. Mariottes blind spots. Experimental figure. entrance of the optic nerve (o
. A treatise on diseases of the eye . Purkinje used a perinieter witlifield. ra<lius of 10 cm. He nearsighted and measured his own FIELD OF VISION 141 half of the retina, or that the fovea eentraHs is placed coiisidt-rahly tothe temporal side of the posterior pole of the eye. i\Iaii(liiier attemptsto prove that a difference of 5 degrees maybe accounted for in this Spot.—The physiological blind spot (Mariottes blind spot)in the field of vision, described by Mariotte in 1668, corresponds to the Fig. 104. Mariottes blind spots. Experimental figure. entrance of the optic nerve (optic disk). Since the horizontal planewhich cuts the nodal point of the eye and the centre of the optic disk formsan angle of 3 degrees with a similar plane cutting the fovea centralis, thecentre of the physiological blind spot occurs 3 degrees below the horizontalmeridian of the field of vision, and as in normal eyes the angle betweenthe plane which passes through the fovea centralis and the nodal Fig. los point of the eye and a similarplane which passes through thecentre of the optic disk is 15 degrees,the centre of the physiologicalblind spot is situated 15 degreesto the temporal side of the verti-cal meridian of the field of blind spot is usually circularand measures about cm. at30 cm. from the cornea. In somecases the outline of the blind spotis slightly oval. The contour ofthe blind sj)ot in moderate illumi-nation is not regular; two or threeshort projections marking the pro-longations of th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteyediseases, bookyear
