Keratoscope
A presentation tweak that may reduce perceived text doubling for some users — no guarantee.
Safety check
New or sudden double vision can be a sign of a serious eye or neurological problem. If your double vision is new or sudden, see an eye professional today.
Keratoscope is a comfort aid, not a medical device, and not a substitute for professional eye care.
Step 1: Which way does the ghost sit?
Look at the sentence below. If you see a pale copy next to each word, pick the direction the copy appears to sit.
Step 2: Line up the pale copy
Line up the pale copy with the shadow you see on real words. Use the slider until the ghost sits on top of the dark text.
Step 3: Match the ghost strength
Set the pale copy's opacity to match how faint or strong the ghost looks to you.
Step 4: Check a real paragraph
Read the paragraph below with your settings applied. If the text looks steadier, continue to export. If not, go back and adjust.
Preview
Reading on screens can be tiring when letters split into two images. This preview shows how your personal Keratoscope settings might look on ordinary page text. Move the slider if the ghost is still visible, then come back here.
This is a presentation tweak, not a medical device. It may reduce perceived doubling for some users — no guarantee.
Step 5: Export your profile
Copy the userstyle below and install it in Stylus or another user-CSS manager.
Advanced: bookmarklet and raw profile
Use these only if you are comfortable with user scripts.