The Putting
Mirror
A putting mirror is a setup checker, not a stroke fixer. Here's what each EyeLine model actually gives you, how to run the gate drill, and what the rules say about carrying one.
A putting mirror is a flat mirror with alignment lines that lets you check your setup at address: where your eyes sit relative to the ball, whether your shoulders match the target line, and where the putter face points. That's the whole job, and the two EyeLine models split it cleanly. The Classic (check current price) is the setup and alignment checker. The Groove Plus ($79.95†) is the larger model that adds adjustable putter, ball, and impact gates, so it's the one to buy if you want gate work. Buy the Classic for setup discipline, the Groove Plus if you want the drills too.
What a Putting Mirror Actually Checks
It checks three things at address, and nothing else. That limitation is the point: setup is the part of putting you can verify objectively in a living room, and most golfers have never actually verified it.
Eye position. Look down and you see exactly where your eyes sit relative to the ball line: over it, inside it, or outside it. The value isn't hitting some universal correct spot, it's making your own position repeatable session to session instead of drifting without noticing.
Shoulder alignment. The lines run parallel to your target line, so open or closed shoulders show up immediately. EyeLine sells shoulder alignment as a feature of the larger mirrors specifically, and it's the check that's hardest to self-diagnose without a reference, because you're looking down the line from an angle that flatters you.
Putter face aim. EyeLine's Groove Plus page describes a dedicated face line for exactly this. Setting the face against a true perpendicular reference is a different experience than trusting your eyes, and that's the whole reason the category exists.
What a mirror does not do is fix stroke mechanics, green reading, or speed control. If your problem is distance control on lag putts, a mirror will not help you, and no amount of setup work will substitute. I'd rather say that plainly than sell the thing as a cure.
The 3 Drills That Make It Work
Drill 1: The setup check (works on every model). Place the mirror on your putting mat or green, aim its lines at a target, and take your normal address. Note where your eyes and shoulders actually are versus where you assumed they were. Adjust until they match the lines, then hold the position for a ten-count. Two minutes, every session, and it's most of what the tool is for.
Drill 2: The gate drill (needs a gate-equipped model). This is the drill people buy a mirror for, and it's worth being precise about which model runs it. EyeLine's Groove Plus lists adjustable gates for the putter, ball, and impact zones and ships with six indoor putting posts. The Classic page describes setup and alignment checking, not gates, so if the gate drill is why you're buying, buy the Groove Plus rather than assuming the cheaper mirror covers it. Set the gate just wider than the putter head and stroke putts through without contact.
Drill 3: Set up, then verify. Take your address away from the mirror, freeze, then slide the mirror underneath and see whether that position would have passed. This is the drill that moves the feedback into feel, which matters because the mirror is not coming out onto the course with you during a round.
Which One to Buy
On tour usage: EyeLine's Groove Plus page states that sixteen of the top twenty players in the world use an EyeLine putting mirror and that the design came out of more than twenty years of working with tour players. Those are the company's own marketing claims, published on its own product page, and I have no way to audit them. Weigh them accordingly. They are a reason the brand is well known, not evidence that the tool will lower your scores.
On cheaper alternatives: you'll find mirrors in the fifteen to twenty-five dollar range, and I don't have verified durability or line-accuracy data on any of them, so I'm not going to invent a verdict. What I can point out is the structural difference: the budget listings I looked at do not publish a gate system or a return guarantee, and EyeLine publishes both. If you buy cheap, buy it as a setup checker and judge the lines against a straight edge yourself.
The Rules Question: Can You Carry One?
Carrying a putting mirror in your bag is not itself a breach. The problem is what you do with it during a round.
Two rules govern this. Rule 4.3 restricts using equipment in a way that eliminates or reduces the need for a skill or judgment that is fundamental to the game. Rule 10.2b(3) covers objects set down to help you with aim, stance, or swing, and an object placed to show your line has to be removed before the stroke. Putting a mirror on the green and aiming your stroke off it during a round is what the rules are aimed at, not the act of owning or transporting one. Practice rounds and the practice green are a different situation, and your committee's own conditions can add restrictions on top.
If you compete, read the USGA equipment rules and the official clarifications rather than relying on a product listing's summary of them. That's the practical argument for Drill 3: the feedback you can take onto the course is the feedback that lives in your setup routine, not on a piece of acrylic.
Sources
- EyeLine Golf, Classic EyeLine Putting Mirror official product page (features, guarantee, price)
- EyeLine Golf, Groove Plus Putting Mirror official product page (gates, included posts, tour claims, price)
- USGA, Equipment Rules, Part 5
- USGA, Clarifications of the Rules of Golf
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