I really like these sunglasses. I have dry and itchy eyes that drive me crazy. These glasses guard my eyes from light, wind, and sand coming in from above, below, and the side (but allow peripheral vision). They protect against UV rays and glare, but they are not too dark. And they fit over my prescription glasses. I use these for driving, nature watching with binoculars, and  I plan to take them on a cruise. I believe they will be great for whale watching.