Aier Eye Hospital Group Co., Ltd. (SZSE:300015) shares have had a really impressive month, gaining 26% after a shaky period beforehand. Not all shareholders will be feeling jubilant, since the share price is still down a very disappointing 36% in the last twelve months.

In spite of the firm bounce in price, you could still be forgiven for feeling indifferent about Aier Eye Hospital Group's P/E ratio of 28.9x, since the median price-to-earnings (or "P/E") ratio in China is also close to 29x. While this might not raise any eyebrows, if the P/E ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

Aier Eye Hospital Group certainly has been doing a good job lately as its earnings growth has been positive while most other companies have been seeing their earnings go backwards. It might be that many expect the strong earnings performance to deteriorate like the rest, which has kept the P/E from rising. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's not quite in favour.

What Are Growth Metrics Telling Us About The P/E?

In order to justify its P/E ratio, Aier Eye Hospital Group would need to produce growth that's similar to the market.

Retrospectively, the last year delivered an exceptional 26% gain to the company's bottom line. The latest three year period has also seen an excellent 66% overall rise in EPS, aided by its short-term performance. Therefore, it's fair to say the earnings growth recently has been superb for the company.

Shifting to the future, estimates from the analysts covering the company suggest earnings should grow by 13% per year over the next three years. Meanwhile, the rest of the market is forecast to expand by 19% per year, which is noticeably more attractive.

In light of this, it's curious that Aier Eye Hospital Group's P/E sits in line with the majority of other companies. It seems most investors are ignoring the fairly limited growth expectations and are willing to pay up for exposure to the stock. These shareholders may be setting themselves up for future disappointment if the P/E falls to levels more in line with the growth outlook.

The Final Word

Its shares have lifted substantially and now Aier Eye Hospital Group's P/E is also back up to the market median. Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

We've established that Aier Eye Hospital Group currently trades on a higher than expected P/E since its forecast growth is lower than the wider market. Right now we are uncomfortable with the P/E as the predicted future earnings aren't likely to support a more positive sentiment for long. This places shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

There are also other vital risk factors to consider before investing and we've discovered 2 warning signs for Aier Eye Hospital Group that you should be aware of.

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.