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Answer :
To determine which prescription is correctly, clearly, and accurately written, we must evaluate the options based on common prescription notation standards, particularly for optical prescriptions (which these appear to resemble). Here’s a breakdown:
1. Option (a) `[tex]$-2.00-2.00 \times 195$[/tex]`:
- This could denote a prescription for a lens with a sphere of -2.00 diopters, a cylinder of -2.00 diopters, and an axis of 195 degrees.
- Axis values for cylinder prescriptions are typically between 0 and 180 degrees. Since 195 is outside this range, this notation is incorrect.
2. Option (b) `[tex]$-2.00+2.00 \times 197$[/tex]`:
- This has a sphere of -2.00 diopters, a cylinder of +2.00, and an axis of 197 degrees.
- Like the previous option, the axis value must be between 0 and 180 degrees, making this prescription incorrect as well.
3. Option (c) `[tex]$+5.0-.25 \times 080$[/tex]`:
- This indicates a sphere of +5.00 diopters, a cylinder of -0.25 diopters, and an axis of 80 degrees.
- All components are written correctly with valid ranges. This format is clear and standard in optical prescriptions.
4. Option (d) `-9.00 OS`:
- OS stands for “oculus sinister,” meaning the left eye, with a spherical correction of -9.00 diopters.
- While clear, it lacks information about the cylinder and axis if they are needed. If no cylinder correction is needed, this can still be correct.
5. Option (e) `[tex]$-2.35-2.00$[/tex] ADD: +1.25`:
- This could be a multifocal lens prescription with a sphere of -2.35 diopters, a cylinder of -2.00 diopters, and an add value of +1.25.
- The lack of an axis for the cylinder makes this incomplete. The axis is necessary for cylinder values.
Based on this analysis, option (c) `[tex]$+5.0-.25 \times 080$[/tex]` is correctly, clearly, and accurately written, adhering to standard optical prescription notation without errors or missing components. Therefore, (c) is the correct choice.
1. Option (a) `[tex]$-2.00-2.00 \times 195$[/tex]`:
- This could denote a prescription for a lens with a sphere of -2.00 diopters, a cylinder of -2.00 diopters, and an axis of 195 degrees.
- Axis values for cylinder prescriptions are typically between 0 and 180 degrees. Since 195 is outside this range, this notation is incorrect.
2. Option (b) `[tex]$-2.00+2.00 \times 197$[/tex]`:
- This has a sphere of -2.00 diopters, a cylinder of +2.00, and an axis of 197 degrees.
- Like the previous option, the axis value must be between 0 and 180 degrees, making this prescription incorrect as well.
3. Option (c) `[tex]$+5.0-.25 \times 080$[/tex]`:
- This indicates a sphere of +5.00 diopters, a cylinder of -0.25 diopters, and an axis of 80 degrees.
- All components are written correctly with valid ranges. This format is clear and standard in optical prescriptions.
4. Option (d) `-9.00 OS`:
- OS stands for “oculus sinister,” meaning the left eye, with a spherical correction of -9.00 diopters.
- While clear, it lacks information about the cylinder and axis if they are needed. If no cylinder correction is needed, this can still be correct.
5. Option (e) `[tex]$-2.35-2.00$[/tex] ADD: +1.25`:
- This could be a multifocal lens prescription with a sphere of -2.35 diopters, a cylinder of -2.00 diopters, and an add value of +1.25.
- The lack of an axis for the cylinder makes this incomplete. The axis is necessary for cylinder values.
Based on this analysis, option (c) `[tex]$+5.0-.25 \times 080$[/tex]` is correctly, clearly, and accurately written, adhering to standard optical prescription notation without errors or missing components. Therefore, (c) is the correct choice.
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