Sunlight from Windows Causing Unprotected Eye Skin Damage?

UVA light can penetrate through glass windows, so need to make sure to protect your skin even if you are driving or inside, but near windows.  Make sure to choose a sunscreen or moisturizer with sunscreen that contain UVA blockers.  Ingredients to look for include: avobenzone with octocrylne, mexoryl (trade name Ecamsule), zinc oxide, or titanium dioxide.   While topical retinoids, such as tretinoin, can help improve the appearance of fine lines and wrinkles in the long term, you must be careful when you use them because they can make you more sensitive to the sun!

There are two kinds of ultraviolet radiation that affect the skin: UVB and UVA. UVB (the one that causes sunburn) does not generally pass through glass whereas UVA (the one that causes skin wrinkles) does so with relative ease.  The amount of UVA that passes through depends on the type of glass and coatings. Although skin treated with retinoids can be more sun sensitive, your use of retinoids is minimizing any damage caused by the UVA  passing through the glass.

A perfect example of this is the more extensive amount of sun damage on the left cheek, usually the one sun-exposed on the driver side of the car.

Since you were using Retin A which improves sun damage, that would minimize whatever little amount of damage you could have through windows in your home.

The retinoids, such as Retin A can cause the skin to be more sensitive to the sun.  Bescause of this it is advised that reasonable sun precautions be used when applying this product.  What you are doing is reasonable and no permanent damage has been done.