Technic of Refraction Trial Case And Refractive Instruments a Manual of Pract
Technic of Refraction Trial Case And Refractive Instruments a Manual of Pract
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To quickly assess the difficulty of the text, read a short excerpt:
But where it is with the rule, it is usually necessary to deduct somewhere in the neigh- borhood of . 50 D. , owing to the distance of the correcting lens from the eye. If the lens is plus, this increases its value ; if minus, it decreases it.
The Meyrowitz-Javal Ophthalmometer.
1. Seat the patient comfortably. Raise or lower the chin rest until the eyes are in line with and level with the white index marks on the head rest. Cover the eye not under examination.
2. Place the arc bearing the mire...s to the horizontal position, with the axis-indicator pointing to zero.
3. Sight along the barrel of the telescope, and raise or lower the telescope, also swing it to left or right, as may be required, until it points at the eye to be examined.
48 TECHNIC OF REFRACTION 4. Turn on lights. Look through the telescope, and continue the adjusting movements above described until four images of the mires are seen, two being central and two on either side. Ignore the two outer images and re- gard only the two central ones.
What to read after Technic of Refraction Trial Case And Refractive Instruments a Manual of Pract?
You can find similar books in the "Read Also" column, or choose other free books by Thomas George Atkinson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
But where it is with the rule, it is usually necessary to deduct somewhere in the neigh- borhood of . 50 D. , owing to the distance of the correcting lens from the eye. If the lens is plus, this increases its value ; if minus, it decreases it.
The Meyrowitz-Javal Ophthalmometer.
1. Seat the patient comfortably. Raise or lower the chin rest until the eyes are in line with and level with the white index marks on the head rest. Cover the eye not under examination.
2. Place the arc bearing the mire...s to the horizontal position, with the axis-indicator pointing to zero.
3. Sight along the barrel of the telescope, and raise or lower the telescope, also swing it to left or right, as may be required, until it points at the eye to be examined.
48 TECHNIC OF REFRACTION 4. Turn on lights. Look through the telescope, and continue the adjusting movements above described until four images of the mires are seen, two being central and two on either side. Ignore the two outer images and re- gard only the two central ones.
What to read after Technic of Refraction Trial Case And Refractive Instruments a Manual of Pract?
You can find similar books in the "Read Also" column, or choose other free books by Thomas George Atkinson to read onlineMoreLess
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