Lensometer is also known as Focimeter or avertometer (The main use of the lensometer is to measure the back or front vertex power of a spectacle lens. It is a device designed to measure the refractive power prescription of a unknown lens. (spherical, cylindrical with axis and also the optical center) Types:- Manual Automated LENSOMETER Manual Buy Manual lensmeter Optical lensometer Focimeter External Reading AC DC Power NJC-4: Replacement Screens - Amazon.com FREE DELIVERY possible on eligible purchases The Marco Lensmeter 101 is a compact deluxe model with a full 90-degree inclination, which facilitates the measurement of contact lenses when used in the vertical position. Standard equipment on the 101 includes such deluxe features as a prism compensator, external power and axis readings, and an American-style cross-line target. The axis of the cylinder is the direction of the second power reading, ie the least positive power. The direction of this line is measured by aligning the graticule and looking at the axis numbers on the graticule inside the eyepiece. Example: Reading 1 is +3.00D x 90 and Reading 2 is +2.00D x 180. The lens is: +3.00/-1.00 x 180 . 7. This will make prism and DBC measurements more precise. After you place the lens in the lens stop, always turn the focus wheel to -20D and proceed forward (toward the positive) to focus your triple line first. The American National Standard says to focus from the negative side as opposed to positive. Locating and verifying prism, in a manual lensmeter, becomes more difficult when the target is formed by a cylinder prescription and even harder to visualize when there is an oblique cylinder axis. At axes near 90 and 180, the vertical and horizontal lines help to align the location of the prism. Manual Lensmeter Optical Lensometer Focimeter Optometry Reading Device AC/DC US. Condition: New. Quantity: 4 available. Price: US $299.00. No Interest if paid in full in 6 mo on $99+ *. Add to cart. Step 2: Center the mires vertically (even though the sphere and cyl lines will blur slightly), and spot. Verify that there is no vertical imbalance between the OD and OS (starting with the strongest one at 90 is important). Anything outside 1/3 ^ is too much. The unit can with a plug but you can use batteries as well. +. +. This item: Portable Manual Optical Lensmeter/Lensometer Measure Lens Degree Meter. $150.00. FREE Shipping. In Stock. Ships from and sold by KY HOPE. High Quality Optical Optic Trial Lens Frame Eye Optometry Optician，Changeable Cylinder Axis, Adjustable Temple Length and Nose Rest. And then a .25 power difference can just the difference between your eye vs my eye vs equipment calibration. 1. If you lenso is rounding to the nearest 0.25D, the original lens could have been -2.40D and the tint shifted it just a bit, say to -2.35D, enough to round it to -2.25D, instead of -2.50D. Lensometry, Manual . This course content is now included in The Ophthalmic Assistant 12 Week Course for New Hires. Tech Tips: Get the quarterly "Tech Tips" e-letter. Click here to subscribe. Get your Eye/Q Question of the Day: Get a dose of ophthalmic technology via your facebook newsfeed. We will send you a question/answer on many days (M-F