Author

Thomas McDonald

Thomas McDonald is a staff writer at Biology Insights with a focus on everyday vision and eye health. Based in Stowe, Vermont, he spent years writing optical consumer pieces for regional publications. McDonald uses his own experience as a lifelong eyeglasses wearer to explain prescription options and lens care.

Is It Safe to Look at the Sun at Sunset?Physics
What Is Considered Legally Blind Without Glasses?Eyes & ENT
How Long Can You Leave Contacts in Your Eyes?Eyes & ENT
What Eye Power Is Considered Legally Blind?Eyes & ENT
How Long Can You Wear the Same Contacts?Eyes & ENT
How Long Do You Have to Look at Welding to Get Arc Eye?Safety
What Happens If You Keep Your Eyes Closed for Too Long?Eyes & ENT
What Is a Normal Cylinder (CYL) in an Eye Prescription?Eyes & ENT
What Is Better Vision Than 20/20? Defining Superior Vision Eyes & ENT
Why Isn’t My PD on My Prescription?Drugs
Is Getting Hair in Your Eye Dangerous?Eyes & ENT
How to Know If Your Contacts Are in the Wrong Eye Eyes & ENT
How Nearsighted Is Considered Legally Blind?Eyes & ENT
Does a Child With 20/30 Vision Need Glasses?Eyes & ENT
Do Astigmatism Contacts Have Lines?Eyes & ENT
How Long Does It Take for Dilation Drops to Wear Off?Eyes & ENT
How to Tell Which Contact Goes in Which Eye Eyes & ENT
Why Do I Have Eyelashes in the Corner of My Eye?Eyes & ENT
Why Is My Vision Blurry After Taking Off Glasses?Eyes & ENT
What Happens If I Get Mascara in My Eye?Eyes & ENT
Do Colored Contacts Affect Your Vision?Eyes & ENT
What Happens If Sunscreen Gets in Your Eyes?Eyes & ENT
If I Don’t Wear My Glasses, Will My Vision Get Worse?Eyes & ENT
What Does DVA Mean on an Eye Prescription?Eyes & ENT
How Long Does It Take to Get Used to Contacts for Astigmatism?Eyes & ENT
Do Your Eyes Have to Adjust to a New Prescription?Eyes & ENT
How to Safely Get a Piece of Hair Out of Your Eye Eyes & ENT
Why Is There a Line on My Contact Lens?Eyes & ENT
Do I Really Need Glasses With a -0.5 Prescription?Eyes & ENT
Why Do My Eyes Swell Up When I Cry?Eyes & ENT