ND4 split image.jpeg
lens tech image web-01.png
N+D4 Logo-02.png

"Love the new N+D4 lens.

I noticed the biggest improvement at dusk and my night vision was amazing."

Kim Townsend, Optician

Dr. Korthals & Associates

THE 4TH DIMENSION OF OPTIMIZATION FOR 
ENHANCED CLARITY AND CONTRAST IN NIGHT+DAY

The Problem

Pupil dilation in low-light conditions increases the impact of higher-order eye aberrations leading to blurred vision - particularly at dusk, night, or on cloudy, rainy days. 

Night Driving.png
rainy driving

The Solution

Pupil-Optimized Correction takes into account changes in pupil size, the average spherical aberration of the eye, the patient's add power, and the patient's age to optimize the lens.

The Technology

Data analyzed from over a million wavefront exams are used in a unique algorithm to calculate the optimization, making N+D4™ the only night and day technology in the US that does not require specialized equipment to prescribe. 

golden hour on phone.png
dusk on a boat.png
Normal Pupil.png
Dilated Pupil.png

When pupils dilate in low light, high order aberrations change the refraction resulting in blurred vision. 

Refraction with dilated pupil

sph -5.82 cyl -0.16 A 52º

Normal refraction

sph -5.25 cyl -0.50 A 13º

epik™ N+D4™ optimizes every viewing point on the lens for clarity at all distances in all lighting conditions.

Testimonials

Read what colleagues and patients are saying

about N+D4™ lenses.

"Love the new N+D4 lens.

I noticed the biggest improvement at dusk and my night vision was amazing."

Kim Townsend, Optician

Dr. Korthals & Associates