Retinoscopy Or Shadow Test in the Determination of Refraction At One Meter Dis
Retinoscopy Or Shadow Test in the Determination of Refraction At One Meter Dis
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33 #-# or gradual movement is required. A substitution of the quick when the slow movement is necessary, then the refraction cannot always be accurately determined. This is explained under "slow movement. " A quick movement of the mirror may be used when looking into the eye before any correcting lens has been placed in situ. It often tells the character of the refraction.
The slow movement of the mirror and the five-millimeter opening in light-screen come into use and are of the utmost impor- ...tance when the eye has been corrected to within 0. 75 D. Or less, as it is generally at this point that so many, by a quick move- ment, hasten the peripheral rays and mask the central illumination, giving the idea at once of over-correction (see Spheric Aber- ration, Chap. VI). This is a most com- mon error with the beginner, the inexperi- enced, and with those who fail to get good results and who ridicule retinoscopy as "not exact, " or as "not agreeing with the sub- jective method. " It is well in every in- stance, when the point of reversal is ap- proached, to pass the retinal illumination (not the light area on the face) well across the pupillary area to make sure in regard to the character of shadow which follows or precedes it.
What to read after Retinoscopy Or Shadow Test in the Determination of Refraction At One Meter Dis?
You can find similar books in the "Read Also" column, or choose other free books by James Thorington to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
33 #-# or gradual movement is required. A substitution of the quick when the slow movement is necessary, then the refraction cannot always be accurately determined. This is explained under "slow movement. " A quick movement of the mirror may be used when looking into the eye before any correcting lens has been placed in situ. It often tells the character of the refraction.
The slow movement of the mirror and the five-millimeter opening in light-screen come into use and are of the utmost impor- ...tance when the eye has been corrected to within 0. 75 D. Or less, as it is generally at this point that so many, by a quick move- ment, hasten the peripheral rays and mask the central illumination, giving the idea at once of over-correction (see Spheric Aber- ration, Chap. VI). This is a most com- mon error with the beginner, the inexperi- enced, and with those who fail to get good results and who ridicule retinoscopy as "not exact, " or as "not agreeing with the sub- jective method. " It is well in every in- stance, when the point of reversal is ap- proached, to pass the retinal illumination (not the light area on the face) well across the pupillary area to make sure in regard to the character of shadow which follows or precedes it.
What to read after Retinoscopy Or Shadow Test in the Determination of Refraction At One Meter Dis?
You can find similar books in the "Read Also" column, or choose other free books by James Thorington to read onlineMoreLess
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