Why 1.56 May Become Unavailable After You Enter Your Prescription

When you enter your prescription in the JoyeGlasses lens configurator, the lens options shown on screen can change.

That does not necessarily mean something is wrong with your prescription entry.

JoyeGlasses uses separate rules for lens recommendations and lens availability.

A recommendation helps explain how compatible lens indexes are presented for a stronger prescription.

An availability rule determines whether a particular option can be selected for the current configuration.

These are different rule types and should be interpreted separately.

Recommendation and Availability Are Different

The JoyeGlasses High-RX recommendation system evaluates prescription strength and may display guidance for indexes such as 1.60, 1.67 and 1.74.

Separately, the configurator applies product-availability rules.

A lens index can therefore be:

• available but not highlighted as the recommended option;
• available and recommended;
• available as another thickness option; or
• unavailable for the current configuration.

A recommendation label should not be interpreted as the same thing as product eligibility.

For the recommendation logic itself, see how JoyeGlasses calculates your lens-index recommendation.

Why 1.56 May Become Unavailable

One confirmed JoyeGlasses hard rule applies when the relevant SPH value is -8.00 SPH or stronger in the minus direction (SPH ≤ -8.00).

This is a JoyeGlasses storefront availability rule.

It is not a medical threshold, and it does not change or reinterpret the prescription issued by your eye-care professional.

Example: SPH -8.00

This confirmed runtime example demonstrates why lens availability should not be treated as the same thing as the High-RX recommendation system.

The configurator evaluates recommendation rules and availability rules separately.

Does Reaching 6.00D Automatically Disable 1.56?

No.

The 6.00D threshold belongs to the JoyeGlasses High-RX recommendation system.

It does not automatically disable 1.56.

The confirmed hard 1.56 rule described on this page applies when the relevant SPH value is -8.00 SPH or stronger in the minus direction (SPH ≤ -8.00).

How Recommendation Rules and Availability Rules Differ

Recommendation guidance and product availability answer different questions.

A recommendation answers:

Among compatible lens indexes, how does JoyeGlasses present the available choices for a stronger prescription?

An availability rule answers:

Can this particular lens option be selected for the current configuration?

Because they answer different questions, recommendation and availability should be interpreted separately.

For example, a prescription can enter the JoyeGlasses HIGH recommendation band without automatically triggering the hard 1.56 availability rule described on this page.

Why Can Lens Options Vary Between Frames?

Lens availability is not determined by prescription strength alone.

JoyeGlasses notes that available lens options can vary depending on factors such as:

• the selected frame;
• the entered prescription; and
• the selected lens type.

Some frame categories can also use separate compatibility rules.

Rimless frames are one confirmed example: JoyeGlasses handles them through a separate rule path rather than assuming that every option available to other eligible frame configurations applies in the same way.

For the confirmed rimless rules, see the Rimless Glasses Lens Guide.

Why Might Other Lens Options Also Vary?

Lens availability can vary by frame, prescription and lens type.

JoyeGlasses does not assume that the same lens options apply to every configuration.

The configurator shows the options available for the frame and prescription you select.

If an expected option is not shown, review the current options displayed by the configurator or contact JoyeGlasses before ordering.

Do not assume that every unavailable option is caused by the 1.56 rule described on this page.

What Should I Do If the Lens Option I Expected Is Missing?

First, check that your prescription has been entered exactly as provided by your eye-care professional.

Then review the lens options shown for your selected frame and prescription.

Do not change your prescription values simply to make another lens option appear.

If you believe an option is missing unexpectedly, contact JoyeGlasses before placing the order.

Frequently Asked Questions

Why can't I choose 1.56 after entering my prescription?

One confirmed JoyeGlasses rule makes 1.56 unavailable when the relevant SPH value is -8.00 SPH or stronger in the minus direction (SPH ≤ -8.00) in the applicable configurator flow. Other availability behavior should be interpreted according to the options actually shown for your configuration.

Does a 6.00D prescription automatically make 1.56 unavailable?

No. The 6.00D threshold belongs to the High-RX recommendation system. It is not the confirmed hard 1.56 availability threshold described on this page.

Why can 1.60, 1.67 and 1.74 still appear when 1.56 disappears?

In the confirmed SPH -8.00 runtime example, JoyeGlasses disables 1.56 while 1.60, 1.67 and 1.74 remain available. That is a confirmed example, not a guarantee that the same set of indexes will be available for every frame or lens configuration.

Is an unavailable lens option the same as a lens that is not recommended?

No. Unavailable means the option cannot be selected for the applicable configuration. Recommended is guidance among compatible options presented by the configurator. They are separate concepts.

Why are rimless lens options different?

Rimless frames use a separate JoyeGlasses rule path. Confirmed JoyeGlasses rimless behavior includes separate compatibility handling rather than simply applying the generic High-RX path. See the Rimless Glasses Lens Guide for the dedicated explanation.