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OPT-ISM Eye Care Blog
Helpful eye care tips, vision education, and modern optometry insights from OPTISM in Tampa, FL.


What Is an Eye Freckle? Choroidal Nevus vs. Conjunctival Nevus vs. Iris Nevus
Eye freckles are usually harmless pigmented spots, but they should be monitored. Learn the difference between choroidal, conjunctival, and iris nevi, how doctors photograph them, and which warning signs need attention.

David B. Sabin
6 days ago6 min read


Eye Coloboma: A Clinician-Level Guide to Embryology, OCT Findings, Retinal Detachment Risk, and Management
Ocular coloboma results from incomplete closure of the embryonic fissure, classically producing inferior or inferonasal defects involving the iris, lens zonules, chorioretina, optic nerve, or multiple ocular structures. Clinical evaluation should distinguish typical uveal coloboma from atypical coloboma-like lesions, assess macular and optic nerve involvement, document OCT findings, and monitor for complications such as amblyopia, choroidal neovascularization, and retinal det

David B. Sabin
Aug 119 min read


Eye Coloboma: What It Is, How It Affects Vision, and When to See an Eye Doctor
Eye coloboma is a condition present at birth where part of the eye does not fully form. It can affect the iris, retina, optic nerve, lens, or eyelid, and its impact on vision depends on which part of the eye is involved. Some people with coloboma see very well, while others may need glasses, specialty lenses, retinal monitoring, or support for reduced vision. A comprehensive eye exam helps determine whether the coloboma is mostly cosmetic, visually significant, or needs long-

David B. Sabin
Aug 75 min read


Macular Degeneration: Early Signs and Eye Exam Testing
Macular degeneration can cause blurry central vision, wavy lines, and difficulty reading. Learn how retinal imaging and OCT testing help detect and monitor macular changes early.

David B. Sabin
Jul 165 min read


A Clinical Guide to How We See: Image Formation and the Visual Pathway
Vision begins with optical image formation at the retina, but clinically meaningful vision depends on phototransduction, retinal processing, retinotopic organization, optic nerve integrity, chiasmal crossing, LGN relay, optic radiations, and cortical interpretation.

David B. Sabin
Jul 76 min read
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