My eye doctor got my computer prescription wrong, and AI helped me fix it


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Aitor Diago via Moment / Getty Images

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ZDNET’s key takeaways

  • My doctor wrote computer glasses for the wrong distance.
  • ChatGPT, Claude, and Gemini agreed on the problem and the results.
  • The AI-derived glasses worked where the first pair failed.

I recently visited my eye doctor for the usual eye exam and glasses prescription update. While the distance prescription was good, my doc completely failed when it came to my computer glasses.

Fortunately, with the help of ChatGPT, Claude, and Gemini, I was able to get computer glasses that actually do their job.

Most people go for their regular eye exams to an optometrist, a doctor who specializes in eye exams, glasses, contacts, and more routine eye conditions. But since my family has a history of cataracts and glaucoma, I visit an ophthalmologist, a medical doctor who can do all the routine eye care but who also specializes in eye disease, eye surgery, and medical eye treatment.

My ophthalmologist also has techs who work with him to help with the basic eye chart testing. He interprets those results and does the more in-depth eye health exams.

Also: 51% of professionals say AI workslop lowers their productivity – stop it in 2 steps

I find the eye chart tests that determine glasses prescriptions to be very frustrating. Because the test rapidly swaps lenses in an effort to discover which makes the distant text clearer to read, the results are very subjective. Because the stakes are high, exam time is limited, and conditions aren’t ideal, I almost always second-guess every swap.

Even so, I usually end up with a distance prescription that works well enough to help me see clearly.

I am nearsighted, also called myopic. I can easily read a book or a Kindle device near my eyes without needing glasses. I do need glasses to see at a farther distance.

That includes the middle distance where my main computer monitor is. The distance from my eyes to the center of my monitor is 23 inches. It’s a 38-inch, slightly curved monitor, so when I sit at its center, the distance from my eye to the edge is about 29 inches. All hail the Pythagorean theorem.

For years, my then-current distance prescription worked pretty well with the monitor I use. But I noticed over the last year or so that my eyes had started to really strain to see the monitor clearly.

Also: How to learn Claude Code for free with Anthropic’s AI courses – one took me just 20 minutes

Beyond the good health practice of getting an eye exam regularly, my primary reason for visiting the eye doctor this time around was to get a new computer glasses prescription.

That exercise failed miserably. I got completely yeah-yeah-yeahed by both the doctor and the exam tech.

Before I went to the exam, I carefully measured the distances I described above. I knew exactly how far my eyes needed to focus when working on the computer.

Given that I work on the computer far more than I do anything else, this prescription was even more important than the distance prescription. After all, my previous prescription still worked pretty well for distance.

I was very clear about my needs. I described that I generally look up to my monitor, not down like when you read a book. I gave them the measurements. I explained the size of the monitor. I explained the number of hours each day I spend writing, coding, researching, and communicating. I explained that I needed a pair of glasses for computer use, and a pair for distance. I do not want progressives or bifocals.

They gave me back a prescription for progressive or bifocal lenses, with the upper part of the glasses good for distance and the lower part of the glasses good for reading a book.

Also: I quit ChatGPT for a free, private, and local AI called Ollama – here’s why

When I received that piece of paper, I reiterated my needs. This time, they went off and consulted their screens, and wrote me two prescriptions, one for distance and one that they said was a computer glasses prescription. I know it was a computer glasses prescription because they had printed “computer glasses” right on it.

I took both of those prescriptions and uploaded them to Eyebuydirect, an online eyeglasses firm I’ve had success with in the past. A few weeks later, my glasses arrived.

My distance glasses were fine. I could see clearly. I even ordered sunglasses with that same prescription. It’s been years since I’ve had prescription sunglasses, and that was a total win.

The computer glasses, which were created using the prescription labeled “computer glasses,” unfortunately made it impossible for me to clearly see my computer screen.

I had been a little worried this might be the case because they hadn’t tested my vision at a 23-inch distance. They had used a chart at the far end of the room. They’d apparently derived the so-called computer glasses prescription based on the distance prescription, either mathematically or by using some sort of lookup table.

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David Gewirtz/ZDNET

This is where the AI comes in

According to ChatGPT, they derived that prescription wrong. The first thing I did was have ChatGPT look at the prescriptions given to me by my doctor.

My distance prescription had four columns: sphere, cyl, axis, and add, with values for both the left and right eyes. ChatGPT picked up on this right away. Apparently, the add column is the value indicating the extra magnifying power that needs to be added for reading.

This four-column prescription is normally used when prescribing for progressive or bifocal lenses. The idea is that you look down to read, so the lower part of the lens is used to magnify the words on the page. It’s your distance prescription plus extra magnification for looking down at a piece of paper or book. When you look up, like when watching TV or driving, you look through the top of the lens, which has the strength you need for distance vision.

Also: OpenAI’s new image watermarks make it easier to spot AI fakes – here’s how

But I don’t need regular reading glasses. I need computer glasses. Unfortunately, my “computer glasses” prescription was written for a standalone pair of glasses, incorporating the add value that would normally be used at the proper distance for reading a book.

In other words, when I told the eye doctor that I looked up to read my computer screen, they didn’t listen and still wrote the prescription assuming that I would be looking down. When I told the eye doctor my computer screen is 23 to 29 inches away, they didn’t listen and still wrote the prescription for a focus distance of what ChatGPT said was 17 inches.

I also fed the prescriptions into Claude and Gemini, and both reached the same conclusion as ChatGPT. My doctor had completely ignored my use case and gave me one prescription for reading glasses and one prescription for progressives.

Why, I asked the AIs, didn’t the doctor do an eye test at 23 inches? I was told by all three robot brains that that’s not how eye exams are done. Most doctors determine your prescription based on an eye chart across the room, and then use math or a lookup table to determine your reading prescription.

By this point, I was annoyed. I had already called my eye doctor a few times and left messages wanting to explore getting a correct glasses prescription. Meanwhile, I was now almost a month into 12-hour days of seeing my screen more poorly than necessary.

Kids, don’t try this at home

It’s at this point that I need to provide a warning and a disclaimer. Don’t do what I did. I mean, what I did worked out, but don’t do it. You should always go see your doctor and always do what your doctor tells you. Doctors know more than you and me, and they certainly know more than AIs.

Got it? Good.

So, here’s what I did. I fed the details of my screen and the distances of the edges and center from my eyes into ChatGPT, Claude, and Gemini. I also confirmed they were able to read my two scanned-in prescription forms.

Then — now, remember, do not do this at home — I asked them to produce a new computer glasses prescription corresponding to the actual focus distance of my actual screen, not some assumed distance where I might hold a book.

I asked all three AIs because I wanted to get a second and third opinion. I also wanted to avoid the non-deterministic hallucination possibilities that might result from getting calculated numbers back from just one AI.

Also: 5 reasons you should be more tight-lipped with your chatbot (and how to fix past mistakes)

All three AIs agreed and gave me back the same numbers.

Hmm, thought I. OK, thought I. Perhaps, thought I, I should reach out to the glasses company and see what it would cost to redo my computer glasses prescription. If it wasn’t too much, perhaps I’d have it make a pair so I could test the AI-generated prescription.

So I did. Much to my surprise, Eyebuydirect not only offered to remake the glasses for free and ship them to me for free, it refunded 15% of the original purchase price for absolutely no reason I could come up with. I accepted its kind offer, but that was an above-and-beyond, zero-risk opportunity to test out the AI versus the doctor’s prescription.

By this point, I had a three-part plan. The first part was to just try the revised glasses using the AI’s prescription numbers. The second part was, if that didn’t work, go back to my doctor for a revised prescription. The third part was to go to a local glasses shop that offered an in-house exam to see if it came up with a better computer glasses prescription.

The moral of the story

But the revised prescription based on the numbers my AI buddies came up with works perfectly. I’m using those glasses now and have been for a few weeks.

I never did get a call back from my doctor.

Also: I tested ChatGPT Plus vs. Gemini Pro to see which is better – and if it’s worth switching

The moral of this story has to be that you should only get glasses prescriptions from your doctor. Anything else would be irresponsible for me to recommend.

But I rolled the dice and have been quite pleased with the AI-computed results. In two years, when it’s time to go back to my ophthalmologist, I will once again try to explain my working environment. We’ll see if they listen then.

Would you trust AI to double-check a glasses prescription if your new computer glasses made your monitor harder to see? Let us know in the comments below.


You can follow my day-to-day project updates on social media. Be sure to subscribe to my weekly update newsletter, and follow me on Twitter/X at @DavidGewirtz, on Facebook at Facebook.com/DavidGewirtz, on Instagram at Instagram.com/DavidGewirtz, on Bluesky at @DavidGewirtz.com, and on YouTube at YouTube.com/DavidGewirtzTV.





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Recent Reviews


  • Law establishes national prohibition against nonconsensual online publication of intimate images of individuals, both authentic and computer-generated.
  • First federal law regulating AI-generated content.
  • Creates requirement that covered platforms promptly remove depictions upon receiving notice of their existence and a valid takedown request.
  • For many online service providers, complying with the Take It Down Act’s notice-and-takedown requirement may warrant revising their existing DMCA takedown notice provisions and processes.
  • Another carve-out to CDA immunity? More like a dichotomy of sorts…. 

On May 19, 2025, President Trump signed the bipartisan-supported Take it Down Act into law. The law prohibits any person from using an “interactive computer service” to publish, or threaten to publish, nonconsensual intimate imagery (NCII), including AI-generated NCII (colloquially known as revenge pornography or deepfake revenge pornography). Additionally, the law requires that, within one year of enactment, social media companies and other covered platforms implement a notice-and-takedown mechanism that allows victims to report NCII.  Platforms must then remove properly reported imagery (and any known identical copies) within 48 hours of receiving a compliant request.

Support for the Act and Concerns

The Take it Down Act attempts to fill a void in the policymaking space, as many states had not enacted legislation regulating sexual deepfakes when it was signed into law. The Act has been described as the first major federal law that addresses harm caused by AI. It passed the Senate in February of this year by unanimous consent and passed the House of Representatives in April by a vote of 409-2. It also drew the support of many leading technology companies.

Despite receiving almost unanimous support in Congress, some digital privacy advocates have expressed some concerns that the new notice-and-takedown mechanism could have some unintended consequences for digital privacy in general.  For example, some commentators have suggested that the statute’s takedown provision is written too broadly and lacks sufficient safeguards against frivolous requests, potentially leading to the removal of lawful content –especially given the short 48-hour time to act following a takedown request.  [Note: In 2023, we similarly wrote about abuses of the takedown provision of the Digital Millennium Copyright Act]. In addition, some have argued that the law could undermine end-to-end encryption by possibly forcing such companies to “break” encryption to comply with the removal process.  Supporters of the law have countered that private encrypted messages would likely not be considered “published” under the text of the statute (which uses the term “publish” as opposed to “distribute”).

Criminalization of NCII Publication for Individuals

The Act makes it unlawful for any person “to use an interactive computer service to knowingly publish an intimate visual depiction of an identifiable individual” under certain circumstances.[1] It also prohibits threats involving the publishing of NCII and establishes various criminal penalties. Notably, the Act does not distinguish between authentic and AI-generated NCII in its penalties section if the content has been published. Furthermore, the Act expressly states that a victim’s prior consent to the creation of the original image or its disclosure to another individual does not constitute consent for its publication.

New Notice-and-Takedown Requirement for “Covered Platforms”

Along with punishing individuals who publish NCII, the Take it Down Act requires covered platforms to create a notice-and-takedown process for NCII within one year of the law’s passage. Below are the main points for platforms to consider:

  • Covered Platforms. The Act defines a “covered platform” as a “website, online service, online application, or mobile application” that serves the public and either provides a forum for user-generated content (including messages, videos, images, games, and audio files) or regularly deals with NCII as part of its business.
  • Notice-and-Takedown Process. Covered platforms must create a process through which victims of NCII (or someone authorized to act on their behalf) can send notice to them about the existence of such material (including a statement indicating a “good faith belief” that the intimate visual depiction of the individual is nonconsensual, along with information to assist in locating the unlawful image) and can request its removal.
  • Notice to Users. Adding an additional compliance item to the checklist, the Act requires covered platforms to provide a “clear and conspicuous” notice of the Act’s notice and removal process, such as through a conspicuous link to another web page or disclosure.
  • Removal of NCII. Within 48 hours of receiving a valid removal request, covered platforms must remove the NCII and “make reasonable efforts to identify and remove any known identical copies.”
  • Enforcement. Compliance under this provision will be enforced by the Federal Trade Commission (FTC).
  • Safe Harbor. Under the law, covered platforms will not be held liable for “good faith” removal of content that is claimed to be NCII “based on facts or circumstances from which the unlawful publishing of an intimate visual depiction is apparent,” even if it is later determined that the removed content was lawfully published.

Compliance Note: For many online service providers, complying with the Take It Down Act’s notice-and-takedown requirement may warrant revising their existing DMCA takedown notice provisions and processes, especially if those processes have not been reviewed or updated for some time.  Many “covered platforms” may rely on automated processes (or a combination of automated efforts combined with targeted human oversight) to fulfill Take It Down Act requests and meet the related obligation to make “reasonable efforts” to identify and remove known identical copies.  This may involve using tools for processing notices, removing content and detecting duplicates. As a result, some providers should consider whether their existing takedown provisions should also be amended to address these new requirements and how they will implement these new compliance items on the backend using the infrastructure already in place for the DMCA.

What about CDA Section 230?

Section 230 of the Communications Decency Act (“CDA”), 47 U.S.C § 230, prohibits a “provider or user of an interactive computer service” from being held responsible “as the publisher or speaker of any information provided by another information content provider.” Courts have construed the immunity provisions in Section 230 broadly in a variety of cases arising from the publication of user-generated content. 

Following enactment of the Take It Down Act, some important questions for platforms are: (1) whether Section 230 still protects platforms from actions related to the hosting or removal of NCII; and (2) whether FTC enforcement of the Take It Down Act’s platform notice-and-takedown process is blocked or limited by CDA immunity. 

On first blush, it might seem that the CDA would restrict enforcement against online providers in this area, as decisions regarding the hosting and removal of third party content would necessarily treat a covered platform as a “publisher or speaker” of third party content. However, a deeper examination of the text of the CDA suggests the answer is more nuanced.

It should be noted that the Good Samaritan provision of the CDA (47 U.S.C § 230(c)(2)) could be used by online providers as a shield from liability for actions taken to proactively filter or remove third party NCII content or remove NCII at the direction of a user’s notice under the Take It Down Act, as CDA immunity extends to good faith actions to restrict access to or availability of material that the provider or user considers to be “obscene, lewd, lascivious, filthy, excessively violent, harassing, or otherwise objectionable.” Moreover, the Take It Down Act adds its own safe harbor for online providers for “good faith disabling of access to, or removal of, material claimed to be a nonconsensual intimate visual depiction based on facts or circumstances from which the unlawful publishing of an intimate visual depiction is apparent, regardless of whether the intimate visual depiction is ultimately determined to be unlawful or not.” 

Still, further questions about the reach of the CDA prove more intriguing. The Take It Down Act appears to create a dichotomy of sorts regarding CDA immunity in the context of NCII removal claims.  Under the text of the CDA, it appears that immunity would not limit FTC enforcement of the Take It Down Act’s notice-and-takedown provision affecting “covered platforms.” To explore this issue, it’s important to examine the CDA’s exceptions, specifically 47 U.S.C § 230(e)(1).   

Effect on other laws

(1) No effect on criminal law

Nothing in this section shall be construed to impair the enforcement of section 223 or 231 of this title [i.e., the Communications Act], chapter 71 (relating to obscenity) or 110 (relating to sexual exploitation of children) of title 18, or any other Federal criminal statute.

Under the text of the CDA’s exception, Congress carved out Section 223 and 231 of the Communications Act from the CDA’s scope of immunity.  Since the Take It Down Act states that it will be codified at Section 223 of the Communications Act of 1934 (i.e., 47 U.S.C. 223(h)), it appears that platforms would not enjoy CDA protection from FTC civil enforcement actions based on the agency’s authority to enforce the Act’s requirements that covered platforms “reasonably comply” with the new Take It Down Act notice-and-takedown obligations.

However, that is not the end of the analysis for platforms.  Interestingly, it would appear that platforms would generally still retain CDA protection (subject to any exceptions) from claims related to the hosting or publishing third party NCII that have not been the subject of a Take It Down Act notice, since the Act’s requirements for removal of NCII by platforms would not be implicated without a valid removal request.[2]  Similarly, a platform could make a strong argument that it retains CDA immunity from any claims brought by an individual (rather than the FTC) for failing to reasonably comply with a Take It Down Act notice.  That said, it is conceivable that litigants – or event state attorneys general – might attempt to frame such legal actions under consumer protection statutes, as the Take It Down Act states that a failure to reasonably comply with an NCII takedown request is an unfair or deceptive trade practice under the FTC Act.  Even in such a case, platforms would likely contend that such claims by these non-FTC parties are merely claims based on a platform’s role as publisher of third party content and are therefore barred by the CDA. 

Ultimately, most, if not all, platforms will likely make best efforts to reasonably comply with the Take It Down Act, thus avoiding the above contingencies.  Yet, for platforms using automated systems to process takedown requests, unintended errors may occur and it’s important to understand how and when the CDA would still protect platforms against any related claims.

Looking Ahead

It will be up to a year before the notice-and-takedown requirements become effective, so we will have to wait and see how well the process works in eradicating revenge pornography material and intimate AI deepfakes from platforms, how the Act potentially affects messaging platforms, how aggressively the Department of Justice will prosecute offenders, and how closely the FTC will be monitoring online platforms’ compliance with the new takedown requirements.

It also remains to be seen whether Congress has an appetite to pass more AI legislation. Less than two weeks before the Take it Down Act was signed into law, the Senate Committee on Commerce, Science, and Transportation held a hearing on “Winning the AI Race” that featured the CEOs of many well-known AI companies. During the hearing, there was bipartisan agreement on the importance of sustaining America’s leadership in AI, expanding the AI supply chain and not burdening AI developers with a regulatory framework as strict as the EU AI Act. The senators listened to testimony from tech executives calling for enhanced educational initiatives and the improvement of infrastructure needed for advancing AI innovation, alongside discussing proposed bills regulating the industry, but it was not clear whether any of these potential policy solutions would receive enough support to be signed into law.

The authors would like to thank Aniket C. Mukherji, a Proskauer legal assistant, for his contributions to this post.


[1] The Act provides that the publication of the NCII of an adult is unlawful if (for authentic content) “the intimate visual depiction was obtained or created under circumstances in which the person knew or reasonably should have known the identifiable individual had a reasonable expectation of privacy,” if (for AI-generated content) “the digital forgery was published without the consent of the identifiable individual,” and if (for both authentic and AI-generated content) what is depicted “was not voluntarily exposed by the identifiable individual in a public or commercial setting,” “is not a matter of public concern,” and is intended to cause harm or does cause harm to the identifiable individual. The publication of NCII (whether authentic or AI-generated) of a minor is unlawful if it is published with intent to “abuse, humiliate, harass, or degrade the minor” or “arouse or gratify the sexual desire of any person.” The Act also lists some basic exceptions, such as publications of covered imagery for law enforcement investigations, legal proceedings, or educational purposes, among other things.

[2] Under the Act, “Upon receiving a valid removal request from an identifiable individual (or an authorized person acting on behalf of such individual) using the process described in paragraph (1)(A)(ii), a covered platform shall, as soon as possible, but not later than 48 hours after receiving such request—

(A) remove the intimate visual depiction; and

(B) make reasonable efforts to identify and remove any known identical copies of such depiction.



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