is a defect in normal binocular (two-eyed) vision that causes confusion in visual detail.


ICS is a repetitive intermittent loss of visual sensation in the central area of vision.
As the central vision of either eye "turns on and off", aiming errors in sight can occur
that must be corrected when both eyes are seeing again.
“Intermittent” suggests one of the major differences between ICS and strabismic suppression.
An ICS suppression is an “on and off” suppression.
“Central” refers to the central area of sight , i.e., not the peripheral vision.
Therefore, ICS is defined as a repetitive intermittent loss of central visual sensation
in the absence of an eye turn (strabismus) or amblyopia (classic lazy eye).
A person with ICS struggles with a constantly changing visual world.
The letters and words are always in motion.
This causes great difficulty in Reading.



Intermittent Central Suppression: FACTS

  • ICS alternates eyes in 80 to 90% of ICS patients.

  • ICS suppression periods average 2 to 3 seconds in length

  • If your child can’t read by grade 3, they may become a high school dropout

  • Is your child in special reading class? 80% of remedial readers test positive for ICS

  • Students in Adult High School fail the ICS test 99.9% of the time

  • Received a score of 18 or lower on your ACT? You may have ICS

  • Many children see the results in just 2 weeks, once they’re treated for ICS

Intermittent Central Suppression Fact


Intermittent Central Suppression: SYMPTOMS


People With ICS:

  • Say that words on the page appear to blur or jump around

  • Struggle to follow a series of instructions

  • Have messy handwriting

  • Speak slowly

  • Avoid reading aloud



Intermittent Central Suppression (ICS) can have the same exact symptoms as Dyslexia



ics testing: n2 reading testing glasses

With so many similar signs and symptoms between dyslexia and Intermittent Central Suppression (ICS),
how can you know which is the root cause of your child’s reading problems?
You can test for this problem with a home test that takes about 90 seconds to complete
with N2 Reading Testing Glasses.
That’s right! No time wasted!
The test only costs about $30.



ICS treatment: n2 reading treatment glasses

N2 Reading Treatment Glasses use Alternating Occlusion Therapy to treat ICS.
The person wears the occlusion goggles continuously for several hours
while performing regular everyday activities.
Wearing the device encourages or forces the alternating use of both eyes,
similar to eye patching, but rapidly alternating in time.
The aim is to circumvent the tendency to suppress the field of view of the weaker eye
and to train the capacity for binocular vision.