What is the 5-year success rate of a corneal transplant?

The short answer? 76%.

A new study published in the Canadian Journal of Ophthalmology examined 596 patients who had primary penetrating keratoplasty between 2011 and 2017. The authors found the 3-year survival rate was 78%. At 5 years, the survival rate was 76%, and at 7 years it was 73%.

Is this different from what was previously published?

Yes. Previous studies suggest that the success rates were higher, around 90% at 5 years.

In other news:

Floating the idea of same-day bilateral cataract surgeries? In an editorial published in Ophthalmology, the authors suggest that the time for bilateral same-day cataract surgery is now.


Can glasses protect me from COVID?

A recent study published in JAMA Ophthalmology found that glasses wearers may be less likely to be infected with COVID-19.

Tell me about the study.

The study examined 276 patients in Suizhou, China, who were hospitalized due to COVID-19. Of these patients, 30 wore glasses (16 were myopic and 14 were presbyopic). The 16 myopic patients with COVID-19 who wore their glasses for more than 8 hours per day accounted for 5.8% of patients in the study.

Why is this significant?

One of the main findings of this study was that patients with COVID-19 who wear glasses for more than 8 hours per day were relatively uncommon, representing only 5.8% of patients. The authors associated this with less susceptibility to COVID-19 infection.

Why do they think wearing glasses helps?

There are a couple of theories:
1. Wearing glasses prevents or discourages wearers from touching their eyes, thus avoiding transferring the virus from the hands to the eyes.
2. An abundance of the SARS-CoV-2 receptor angiotensin-converting enzyme 2 has been found on the ocular surface through which SARS-CoV-2 can enter the body. Wearing glasses may become a protective factor, reducing the risk of virus transfer to the eyes.

Why might my patient ask me about this?

Because this study made its way into mainstream media (here, here, here, and here, to name a few sources).

Should we recommend that everyone wear glasses?

Not yet. In fact, an infectious disease specialist at Johns Hopkins School of Medicine wrote a commentary on this study discussing some of its flaws.



The percentage of US adults who have skipped medical care since COVID. (via)

The death of one brand of smart glasses inevitably means the birth of another.

Facebook and EssilorLuxottica announced their collaboration on a new generation of smart glasses. The first product will be branded Ray-Ban and is scheduled to launch in 2021. This news comes after VSP discontinued the production of their Level smart glasses. (via)

Looking for a new podcast?

Check out GlobalEyes! Drs. Tom Arnold and Melissa Barnett will be chatting with eye care practitioners from around the world and exploring the state of eye care in their home countries.

Thinking outside the box.

Lumenis is launching a traveling outdoor trade show. (via)

See you next week!