235
21 Point Exams (only for Plus Package)
21 Point Exams Result (only for Plus Package)
5
Heterophoria AC/A
The Heterophoria AC/A value is automatically calculated and displayed when values for “#8
H.Phoria(F)” and “#13B H.Phoria(N)” are entered. This value is calculated by the formula
below.
AC / A = PD - d x (Phoria(Far) - Phoria(Near))
PD(cm): pupillary distance
d(m): near point phoria measurement distance
Phoria: Exophoria (-), Esophoria (+)
Sheard (F), Sheard (N)
Prism values and SPH adjustment values that satisfy the Sheard’s criterion.
The RT-5100 automatically calculates and displays the prism value necessary to satisfy the
criterion necessary for Sheard’s criterion calculation when values for phoria and fusional
convergence reserve or fusional divergence reserve are entered. In addition, with AC/A, the
SPH adjustment value is calculated and displayed in parentheses. The SPH adjustment
value is the value for how much to increase/decrease the value against #7 Subjective value.
The SPH adjustment value is displayed in pink when the value is negative.
When the criterion is satisfied, 0.00 is displayed. If there is no necessary data so calculation
is not possible, the field is blank.
The value is calculated by the following formulas.
=
2P-R
3
SPH
=
AC / A
: Necessary prism value for satisfying the criterion
P: Phoria value
R: Fusional convergence reserve or fusional divergence reserve
•Fusional convergence reserve basically uses blur value (Far point: #9, Near point: #16) for
calculation. If there is no blur value, use the break value (Far point: #10Break, Near point:
#16Break) to calculate.
•For fusional divergence reserve, break value (#11Break) is used basically for far point to
calculate. For near point, blur value (#17) is used for calculation. If there is no blur value, use the
break value (#17Break) for calculation.
SPH: Necessary SPH adjustment value for satisfying the criterion
AC/A: The default setting is calculated with Gradient AC/A. It can be changed to Heterophoria AC/
A with the “AC/A for Sheard/Percival SPH” parameter.
*Criterion: To maintain the normal binocular vision, values for fusional convergence reserve
or fusional divergence reserve must be two times or greater than those for phoria.
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Uncontrolled copy when printed.
Содержание RT-5100
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Страница 18: ... XVI 161221687130 承認済 Uncontrolled copy when printed ...
Страница 46: ...28 BEFORE USE Getting Started and Exiting 161221687130 承認済 Uncontrolled copy when printed ...
Страница 226: ...208 TEST METHOD Visual Acuity Test by ETDRS chart 161221687130 承認済 Uncontrolled copy when printed ...
Страница 274: ...256 MAINTENANCE List of Replacement Parts 161221687130 承認済 Uncontrolled copy when printed ...
Страница 302: ...284 EMC ELECTROMAGNETIC COMPATIBILITY 161221687130 承認済 Uncontrolled copy when printed ...