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Optometry precisely adjust the degree of astigmatism

If red dot with astigmatism test piece axes to coincide with more clarity, the original astigmatism owes straightening, increase -0.25DC and continue to flip, clarity on both sides until you adjust to the same cylinder increases when -0.50DC, scope should be reduced -0.25DS.

If white spots with astigmatism test piece axes to coincide with more clarity, the original astigmatism correction, you reduce -0.25DC, and then continue to turn until clarity on both sides adjusted to the same, when the cylinder decreases -0.50DC, spherical -0.25DS should be added.

For example, patients with astigmatism axis adjustment, try hole number -3.50DS/-1.00DCx100. When adjusting the astigmatism, need to point p to be crossed cylindrical mirrors to try with astigmatism axis coincide to 100 ° position, turn the wheel changed hands were named on both sides 1 and 2 sides (as shown in Figure 5a and b), leaving more clarity on both sides are the same.