> ## Content Index > Fetch the complete content index at: https://www.medi-hi.com/llms.txt > Use this file to discover other available public pages before exploring further. # Macular Degeneration Screening: What Distorted Vision Really Means - URL: https://www.medi-hi.com/en/info/cataract_macular_diff-en/ - Published: 2026-10-06T00:24:30.000Z - Updated: 2026-10-06T05:06:29.000Z - Author: medihi - Tags: 백내장∙노안, #info, #in_루나, #in_비키, #in_의료진감수, #in_구오섭, #gloryseoul, #lang-en POINT ## In This Article A foggy, generalized blur across the entire field of vision is a classic symptom of cataracts. In contrast, central visual distortion—such as straight lines appearing bent or warped—is a key warning sign of macular (central retinal) abnormalities. Because these two conditions originate in different structures and require different treatment approaches, distinguishing them often requires detailed imaging in addition to self-checks. This post summarizes symptom differences by cause and the essential diagnostic workup. ## 1\. How do cataract symptoms differ from macular disease symptoms? ![An image comparing normal vision with distorted central vision caused by macular degeneration](https://www.medi-hi.com/content/images/2026/10/cataract_macular_diff_01.gif) Cataracts are caused by clouding of the eye’s natural lens, leading to generalized blurred vision at both distance and near, along with glare. By contrast, when there is a problem in the macula—the central part of the retina—patients may experience a central scotoma (a missing or blank spot in the center of text) or metamorphopsia, where straight lines appear curved or distorted. This type of metamorphopsia can be checked relatively easily at home using an Amsler grid test (covering one eye at a time). If an abnormality is suspected, the macula can be evaluated in detail with optical coherence tomography (OCT), which provides high-resolution cross-sectional imaging. Visual distortion can occur not only in macular degeneration but also in epiretinal membrane, vitreomacular traction, macular edema, central serous chorioretinopathy, and macular hole. Because management differs by cause, a precise differential diagnosis should come first. --- ## 2\. What are the limitations of the Amsler grid self-test? ![An illustration demonstrating an Amsler grid self-assessment test for vision distortion](https://www.medi-hi.com/content/images/2026/10/cataract_macular_diff_02.png) Even if the Amsler grid looks normal, retinal disease cannot be ruled out. The Amsler grid is a self-check using a graph-paper-like grid. While wearing reading glasses or presbyopia-correcting glasses (if needed), hold it about 30 cm away and look at it with one eye covered at a time. It can help detect early warning signs of macular problems. If straight lines look wavy or parts of the grid appear missing, it should prompt consideration of a detailed examination. The brain integrates surrounding visual information and can “fill in” damaged areas of vision. Because of this, false-negative cases occur in which the grid appears normal but hidden lesions are found on cross-sectional imaging. Therefore, the grid should be used only as a supportive tool. If the “texture” of your vision feels different than usual or you notice distortion, it is safer to undergo a detailed evaluation with specialized diagnostic devices. --- ## 3\. What are the key tests to confirm macular disease? To assess the macula, clinicians typically proceed step-by-step starting with a dilated fundus examination, followed by OCT and fluorescein angiography. This is because subtle microstructural retinal damage is difficult to identify by direct observation alone. **✅Three-step testing pathway for detailed macular differential diagnosis** - **Dilated fundus examination:** A basic test performed after dilating the pupil to evaluate deeper retinal structures and overall vascular abnormalities. - **OCT:** Uses light to capture micrometer-scale, cross-sectional (3D) images of the retina and assess findings such as edema. - **Fluorescein angiography:** After administering a contrast dye, imaging is performed to detect microleakage from retinal vessels or the presence of neovascularization. --- ## 4\. Why is OCT performed before cataract surgery? Preoperative OCT before cataract surgery is performed to detect macular disease hidden behind a cloudy lens and to help predict postoperative prognosis. If the degree of lens opacity does not match the severity of central visual distortion, there is a higher likelihood of coexisting macular pathology. Clinical studies also show that preoperative OCT often reveals previously unrecognized epiretinal membrane or early macular degeneration. If cataract surgery is performed without identifying macular pathology, the degree of visual improvement may be limited, so treatment priorities should be determined accordingly. --- ## 5\. How are macular degeneration stages differentiated, and how is each treated? ![A 3D medical education rendering comparing the structural differences between dry and wet macular degeneration](https://www.medi-hi.com/content/images/2026/10/cataract_macular_diff_03-2.png) Once macular degeneration is diagnosed, treatment goals and strategies differ depending on the stage. **✅Status and treatment for dry vs. wet macular degeneration** - **Dry (non-exudative) macular degeneration:** An early-to-intermediate stage in which waste deposits called drusen accumulate under the retina. The goal is to slow progression; smoking cessation and UV protection are essential. Macular degeneration supplements (AREDS2) are recommended only for higher-risk groups, typically intermediate stage or beyond. - **Wet (exudative) macular degeneration:** A higher-risk stage in which abnormal new blood vessels (neovascularization) grow and cause bleeding or fluid leakage. Anti-VEGF (intravitreal) therapy involves injecting medication directly into the eye to suppress abnormal vessel growth. Injection intervals are adjusted and gradually extended based on retinal response. --- ## 6\. Frequently Asked Questions (FAQ) #### Q. Straight lines look wavy only when I cover one eye. Do I need to see a doctor? Central visual distortion that is prominent in only one eye is a strong sign suggestive of macular disease. When using both eyes, the brain’s visual compensation may mask the abnormality. If distortion is detected in one eye, prompt evaluation with a dilated fundus examination and OCT to identify the cause is recommended. #### Q. If my Amsler grid looks normal, why is OCT still recommended? Because false negatives are possible—early microstructural changes or certain macular conditions may be missed on the grid test. To accurately assess subtle cellular damage and fluid leakage in deeper retinal layers, OCT is needed because it provides high-resolution cross-sectional images. #### Q. Should everyone take macular degeneration supplements (AREDS2)? Large clinical studies have mainly shown meaningful benefit in specific high-risk groups, such as intermediate-stage macular degeneration or severe lesions in one eye. Evidence for routine preventive benefit in early cases or in people with healthy maculae is limited, so the decision should be made after a clinical evaluation. #### Q. How often are anti-VEGF intravitreal injections given? The number of injections and the interval are individualized based on retinal structural response and changes in vision. Early on, injections are often given at fixed intervals (e.g., every 4 weeks) for induction treatment. After subretinal fluid or bleeding decreases, a personalized schedule that gradually extends intervals (treat-and-extend) is commonly used. [ RECOMMENDED READ Presbyopia LASIK vs. Cataract Surgery: How to Choose the Right Vision Correction Experiencing blurry vision in your 40s or 50s? Learn the crucial differences between presbyopia LASIK and cataract surgery to choose the right treatment for your eyes. ➔ ](https://www.medi-hi.com/en/info/cataract%5Fvs%5Flasik-en/) This health content has been reviewed by medical professionals, compiled from authoritative domestic and international sources, and is regularly updated in accordance with the latest clinical guidelines. Last Reviewed: Oct 6, 2026 Last Updated: Oct 6, 2026 ### Sources - Korean Ophthalmological Society, Guidelines for the Diagnosis and Treatment of Age-related Macular Degeneration, 2022. - Bjerager et al., Diagnostic Accuracy of the Amsler Grid Test for Detecting Neovascular AMD: Systematic Review & Meta-analysis, \*JAMA Ophthalmology\*, 2023. - Icoz et al., Macular pathology detection with optical coherence tomography before cataract surgery, \*BMC Ophthalmology\*, 2024. ※ The copyright for all content on this blog belongs to medihi. Unauthorized copying, distribution, or derivative use is strictly prohibited, and violations may result in legal action without prior notice.