Getting Started

Plus/Minus

To get started OpticslTool alreadyhas values entered into each text field, when you tap into the text field the value will clear and you can enter what you like.  
Plus signs are not necessary, but if you double tap above the keyboard you will see a plus “+” sign and a single tap will give you a minus “-“ sign.

Sharing

If there is an arrow pointing up in the right hand corner you have the ability to share the image, view the formula, or find help on the page you are located.

BC Analysis

Base curve analysis allows you to determine tangential, sagittal and mean oblique power.  The dotted line in the center represents the far point sphere as the tangential and sagittal lines move away from the far point sphere you incur more off-axiis aberrations.
FT is the tangential power, these are the rays in the vertical plane measured from the back vertex of the lens..
FS is the sagittal power, these are the rays in the horizontal plane measured from the back vertex o fhe lens. 
MOP is the mean oblique power or the average of the tangential and sagittal powers.
As you move the red line you will see the tangential and sagittal numbers change, this is to indicate the tangential, sagittal, and mean oblique power at the degree of rotation.
Percival is a lens design that eliminates mean oblique power
Point Focal is a lens design that eliminates oblique astigmatism by having the tangential and sagittal rays come to a focus at the same location 
Min T is a lens design that eliminates tangential error.  This design was created by Dr. Edgar Tillyer of AO

Lens Analysis

Allows you to evaluate every aspect of the lens at the desired eye rotation.

• TCA is the trans chromatic aberration

• Abbe value is the constringence on the lens

• Edge Thickness is the edge thickness for the given minimum diameter

• Center Thickness is teh center thickness

• Weight is the estimated weight based on material, thickness, and blank size

• Specific gravity is the ratio of the mass of a material or liquid compared to the mass of an equal volume of water (at 4°C)

• Y1 is the height of the incident ray on the front surface

• Y2 is the height of the refracted ray on the back surface

• F1 Surface Power is the actual front power based on the material index

• F2 Surface Power is the actual back power based on the material index

• F1 Sag is the sagittal depth in millimeters of the front surface

• F2 Sag is the sagittal depth in millimeters of the back surface

• Index He d is the index of the material as referenced on the helium d line

• Index Hg e is the index of the material as referenced on the mercury e line

• RMS Error is the root mean square which is a measure of the mean power error and the astigmatic error.

• Prism

TCA Analysis

TCA anaylsis give the the trans chromatic aberration at a given angle of rotation for all common materials witha. given vertex distance and base curve.  The TCA cutoff is a blue dotted line that the acceptable amount of TCA

Tscherning Analysis

Tscherning Analysis evaluates the best Wallaston and Ostwalt curve for a given material, thickness, and center of rotation.  You can also add a power to see what curves would be recommended for that power.  You will notice a maximum plus and minus that can be produced in point focal form.