Premium Only Content

EEVblog 1554 - Optometrist AutoRefractor Keratometer TEARDOWN!
A teardown of a very interesting bit of optometry kit, a Shin Nippon NVISION K-5001 RefKeratometer (Auto Refractor Keratometer).
It can measure the curvature of your cornea, and well as refractive error to diagnose near and far sightedness.
Links:
https://www.rexxam.co.jp/themes/eye-care/products/images/nvk5001/NvisionK5001.pdf
https://www.academia.edu/59315264/Clinical_Evaluation_of_the_Shin_Nippon_NVision_K_5001_Grand_Seiko_WR_5100K_Autorefractor
https://www.opticsforhire.com/blog/keratometer-optical-design/
Manual: https://www.yumpu.com/en/document/read/25018677/english-manual
00:00 - What is an AutoRefractor Keratometer?
03:41 - Don't try this at home kids! Can Dave measure his eyeball?
06:17 - Teardown
08:14 - Pupil distance measurement
09:43 - Should have read the manual...
11:22 - How the Keratometer mire circle is generated
13:42 - Optical path and lenses
15:47 - The camera
16:53 - Fine auto-focus mechanism
18:22 - Main PCB
Forum:
If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog
Or with crypto:
BTC: 33BsprBQNBtHuVzVwDmqWkpDjYnCouwASM
ETH: 0x68114e40ff4dcdd384750500501e20acf3875f8c
BCH: 35n9KBPw9T7M3NGzpS3t4nUYEf9HbRmkm4
USDC: 0x68114e40ff4dcdd384750500501e20acf3875f8c
LTC: MJfK57ujxy55su4XicVGQc9wcEJf6mAoXF
Web Site: http://www.eevblog.com
Other channels:
EEVblog2: http://www.youtube.com/EEVblog2
EEVdiscover: https://www.youtube.com/eevdiscover
T-Shirts: http://teespring.com/stores/eevblog
#ElectronicsCreators
-
16:07
EEVblog Channel
1 year ago $0.05 earnedEEVblog 1586 - Stranger Things Decade Resistor Box + Repair
5842 -
LIVE
The Quartering
1 hour agoHillary Clinton FINALLY BUSTED, Nancy Pelosi MELTDOWN, Kamala Harris Admits Defeat & More
10,422 watching -
DVR
Sean Unpaved
2 hours agoSchlereth Unplugged: 3x Champ Talks TV, Football, & 2025 Season Expectations
2.78K -
Russell Brand
2 hours agoCan You Really Take an Unbiased Look at Hitler? - SF624
36.2K20 -
LIVE
Barry Cunningham
5 hours agoMUST SEE: KAROLINE LEAVITT HOSTS WHITE HOUSE PRESS CONFERENCE ( AND MORE NEWS)
2,209 watching -
58:53
The White House
1 hour agoPress Secretary Karoline Leavitt Briefs Members of the Media, July 31, 2025
1.66K4 -
LIVE
JuicyJohns
5 hours ago $2.43 earned🟢#1 REBIRTH PLAYER 10.2+ KD🟢$500 GIVEAWAY SATURDAY!
92 watching -
LIVE
IrishBreakdown
1 hour agoNotre Dame Fall Camp Practice Report
32 watching -
1:04:08
Timcast
2 hours agoPelosi MELTS DOWN After Trump Accuses Her Of INSIDER TADING, PELOSI ACT Moves Forward
111K56 -
1:54:53
Steven Crowder
4 hours ago🔴 Is the Sig Sauer P320 Killing People & Trump Wins the Trade War: Guest Brandon Herrera
249K201